Are you comparing the internet to reality? Because the internet is not reality, the type of behavior you see on reddit and 4chan may reflect our nature, but it is enabled by anonymity and the complete lack of repercussions. If people behaved the way they do on these boards they would quickly be ostracized by society if not having the shit beaten out of them on a regular basis.
Applying some sort of freedom ideology to internet communities like reddit is not very useful in practice. We have to look at the shape of the internet and recognize that freedom on the internet is not the problem—after all cyberspace is unlimited, you can have infinite communities, and geography is irrelevant. All groups can find a place on the internet, and they will always be able to. We simply don't need to worry about that, and it's silly to wring our hands over the decision to moderate this or that community.
What we do need to worry about is the ability for formerly marginalized sociopaths to hurt other people from the safety of their basement dwelling. Whether it's unending bombardment of harassment or actual physical harm like swatting, we need to get a handle on this. Arguing that hate speech should not be moderated or restricted in any way is sort of like giving equal coverage to crackpot climate change deniers on basis of "fairness".