People still doing this? Bernie did nothing wrong. Clinton ran a losing campaign. End of story.
No.
You can repeat it all you want, but putting it all on Clinton, and only Clinton, is not only wrong it's dangerous because it normalizes her opponent and circumstances, puts no responsibility on the electorate to inform themselves of the consequences of their vote, and discards all possibilities that her primary opponent went too far in damaging her appeal to core progressive voters, which he absolutely did (to which extent is unknown afaik).
Now was Clinton a very flawed candidate and is this outcome partially on her? Absolutely. But this is in no way 100% on Clinton.
If this idea spreads, then we are doomed to repeat this result in spite of changing demographics, because we will be unwilling to affect systematic changes considering that "we just need the right candidate".
What the DNC needs, and fast, is to find a way to identify the hundred of thousands of likely voters leaning left who refused to vote or went to the polls and voted Green or left the presidential vote blank, and do a deep analysis of why, in the states of Oh, Mi, Wis, Fl and Pa at the very least.
Not just "I couldn't get myself to vote for Clinton even if I abhore Trump", but really what happened with Clinton to make them roll the dice with a chance to have Trump get elected?
Did the primary change their view of Clinton? How?
Do they feel they would have voted for another Dem candidate? With what profile?
What aspect of Clinton's perceived image did they find unbearable?
Was the "near certainty" of Clinton getting elected, according to polls, a factor?
How big was the email thing 11 days before the election?
How long before the election did they decide not to vote?
Do they regret not voting?
Etc.