This is a thoughtful post and there are some things I want to take the time to properly respond to. Much of what you say is true and I want to be clear about my intentions with the post and the philosophy I have when it comes to discussing politics in general as opposed to this particular thread.
The first thing I would like to do is clarify my use of the word moderate, which I attempted to declassify by my use of quotes around the term. The political moderate does, absolutely, exist. These people have feelings that are not entirely encapsulated by either party's platform and vote in accordance to the issue at hand versus the politicians themselves. I believe that most people actually fall in this category, although it is a separate issue that most of these people don't actually vote.
In my time as a newly woke denizen of the leftward movement, I've spoken to lots of people who clearly have beliefs that would be foolish to try to assign to polar identifiers of a spectrum. I know many "conservatives" with extremely progressive social policies. I know many "liberals" who are pro-gun (not uncommon here in Maine). This is why people identify as "independents" - they don't want their ideas to be a subscription to an ideology. They want to own their own beliefs, not borrow them from parties or figureheads. These people, true political moderates, would ideally be who most people are talking about when they are discussing the concept of centrism.
There are numerous individual issues where it's possible to take multiple perspectives and arrive at moderate conclusions. Many hot-button issues actually allow for nuanced opinions and beliefs. But others do not.
In 2017, terminology has been weaponized. Self-described "moderates" are increasingly not moderates. Their web presence is undeniable. People with clear and outspoken views trot into comment sections and online threads and attempt to give their alarming ideas an illusion of normalcy. Sometimes they go even further - you see posts on Twitter and Reddit where people say "As a black man," or "As a Democrat," or "As a woman," and then say something that only the most deeply-indoctrinated self-loathing masochist of their demographic could possibly believe.
When nationalist sympathizers, misogynists, race warriors, and people absorbed in Trump's cult of personality attempt to play the both sides angle, they are attempting to normalize and rationalize their disruptive and divisive views.
So I will admit that I am becoming frustrated with people who attempt to take a moderate position on subjects where there is no acceptable range of moderacy. The subject of this thread in particular, about the president equating actual Nazis and white supremacists with people whose collective identity amounts to opposing Nazis and white supremacists, does not allow a moderate position. You either believe people who stand against hatred are as bad as people perpetuating and perpetrating hatred or you know there is a difference.
If somebody attempts to take the "moderate" position on this subject matter, they lying to us or to themselves. They are either entirely uninformed on what actually happened or they are attempting to legitimize destructive hate movements by claiming to be something they are not: ordinary.
In a regular conversation with a regular person, political discourse is best conducted inquisitively. You should ask people questions. What do you believe? Why do you believe that? But what about this scenario, would you feel the same way? It is almost impossible to convince somebody of something by force. You must equip them to come to their own conclusion and hope you've compelled them to see what you believe by asking them questions designed to make them reflect.
An ordinary person, dare I say a moderate, responds well to this method of conversation. It lets them express themselves, unpack what they think, and answer to it in stride. Rather than be met with opposition, they are offered a sincere opportunity to express themselves. I would offer this luxury to anybody I believed was genuinely interested in conversation. This happens very rarely online.
On Twitter once, a feminist tweeted the importance of teaching the accomplishments of female scientists in schools. Somebody responded with "name one woman whose made a meaningful contribution to science." The woman named several, detailing their accomplishments and accolades. The troll responded again with "sounds like we don't need to tell people about them in schools then."
The intellectually dishonest person is not interested in having a conversation. They are interested in proving you wrong. They want to embarrass you, or upset you, and nothing you say matters to them at all. I have wasted so much energy trying to talk to these people. I did it during GamerGate, I did it during the primaries, I did it after the election, but I will not do it today. It is exhausting. It is energy wasted. I will no longer dignify the troll with my attention.
Everything I've said above does present a quandary: how do you know what somebody believes without talking to them? How do you know if they are a troll or if they are just misinformed? How do you know if somebody is open to learning something new or might have something insightful to offer you?
Truthfully, you can't. Not online. Not without trying to talk to them. And when you try, you risk enabling and validating a troll or an edgy political zealot who is now delighted to slam somebody they do not respect. After years of giving everyone a chance, and in the political climate we now live in, I cannot continue to give everybody the benefit of the doubt just to be made a fool of.
This doesn't mean I disregard everything somebody says that isn't already what I believe. Quite the contrary. I maintain that every attempt at dissent must begin with inquisition and you must be accommodating to your opponent before you can attempt to reach them. But I am incredibly discerning with how much credit I give people related to subject matter and conversational context. We are in a thread about something that is all over the board, the news, and social media. It is a firestorm that is far from extinguished and the information around anyone at any given time should be overwhelming.
So, this time, I was not welcoming to the platitude. I felt compelled, above all else, to expose them. In my experience, they were either misrepresenting themselves or were undermining the severity of the conversation from an under-read POV. Because if I'm going to engage with somebody on a conversation like this, I need to know who I'm talking to. No matter what somebody believes, I need one thing from them: sincerity.
The poster I went off on, to their credit, expressed sincerity. When faced with the challenge to admit themselves as immorally pragmatic or simply out of the loop, they confessed to their error. This is admirable. It is something it is a pleasure to see. This is a person we can talk to.
The end result of any conversation I have is rarely to make somebody see the world exactly as I do. I do not need to exactly agree with people I ally myself with. There is lots of room for disagreement and moderacy and debate within the realm of worldview and I accept that truth before I begin any conversation. But if I am going to have that conversation, I need to expect the same from my partner. I need to know they are in it to explain themselves thoughtfully and respect my response.
Conversations should end when each party has accepted a new perspective whether or not it affects their personally held opinion. I can appreciate other perspectives and even support them politically even if my own opinion is different.
But there is no room for this when it comes to white nationalism, Donald Trump, and the humanity of Americans.
I hope that this responds to your concerns in some way. I would not have responded the way I did in most other contexts. I sometimes find force appropriate. This was one of those times.