The bolded is exactly what it is. And I like that it exist in society. We are all held to it in reality. "Legal structures" don't work for everybody. The system isn't set up to fairly hold people or corporations accountable in a "fair and balanced" way. That's not reality.
Life has always been this way? Why is it that today, people seem to think that we should live a life absent consequences? Has social media clued people to the fact that consequences exist?
Vigilantism is inherently authoritarian and right-wing. Democratic legal structures construe their authority from the principle of 'rule by consent': government and legislators are (in principle) elected by the people to make these judgements over the people with the people's consent. If you feel some part of that system does not properly represent your concern, it could be that the system requires change (lobbying, petitioning, judicial precedents, etc.) or it could be that your concern simply does not meet the requirements for criminal prosecution. If it's the latter, it's deemed that your wants and desires infringe unfairly on the rights and freedoms of others - you're only option at the junction is to argue for a diminishment or suspension of those rights, or rather, to demand an extension of your rights at the expense of another's.
While I fully agree that structures of power and wealth have created loopholes at very high-levels in our legal systems, I do not deem that as a fault with those individuals so much as with the system. Public outrage and petitioning can do a lot change that.
At the heart of vigilantism is laziness, ignorance and contempt. Laziness, because it's far easier to whip up outrage and indignance than it is to lobby for systemic chagne. Ignorant, because it's almost always predicated on the assumption that the law has 'failed', has been 'corrupted' or simply 'doesn't care about something' rather than being constructed in such a way that it is equitable, applicable and enforceable. And lastly, contemptuous because it assumes that justice is about coercion through intimidation and force, rather than being about fairness and communal coexistence. And all of this applies as much to those who stormed the Capitol in 2020 as it does to those who try get celebrities fired over their Tweets.
As I already said above, if something is unlawful, you have options, if it isn't unlawful but you think it ought to be, you have options, and if it is simply something you don't like, you have options.