This is a critical thing that we as a society need to recognize about censorship and political correctness. When we censor people or ostracize them for saying things we don't like, even when what they say is legitimately awful, these people don't disappear, change their minds, or stop voting. They go elsewhere, become more entrenched in their awful beliefs, and because we've pushed them all together, they become more united. They become stronger. And because they become stronger away from us, we don't notice, and we're blindsided when they flex their political power.
Underlying this mistake are some important truths:
1. People who say hateful things are human beings worth engaging with. No, I don't like reading a lot of what people say. It's easy for me to forget that they are human beings with their own struggles and traumas that cause them to believe the awful things they believe. When we dismiss them as trolls, we're dehumanizing them. Such a society doesn't leave room to be wrong and learn--if you're wrong, you're dismissed--and it dismisses the people who are the most dangerously wrong. It's not our responsibility to educate people, but that's irrelevant to the fact that if we don't educate people no one will. We need to engage people who believe awful things, try to understand what needs cause them to believe those things, and try to address those needs with compassion and courage. Truth is the antidote to hate.
2. Free speech doesn't just matter in a legal context. Free speech is protected in the US constitution because it's important in a free society. If we're going to let the discourse of our society move into privately-owned platforms like Reddit/Facebook/Twitter instead of publicly-owned platforms like street corners where newspapers are sold (or, the rest of the internet) then we have to value free speech on those platforms as well.
Too many people are stuck in this idea that the Trump election was an anomaly--that in November Congress will change and in 2020 we'll have a new president. I see no reason to believe this will happen. We have changed nothing about our behavior and we're hoping the ones who elected Trump to change.