This story only recently broke, and already there are several comments intended to preempt objections, ostensibly by lonely white males yearning for an open forum to complain about SJWs and discuss fantasies, as if that preemption had a deep grounding in some service to civility. It's both amusing and saddening to see that type of naivete on display.
While it'd be nice if people would abide by "community guidelines" for civil communication in a public forum, both in terms of proposing arguments and reacting to them, any time such standards are imposed as a filter, broad abuses of those guidelines soon follow. I mean, one of the few things as enticing as spreading your own idea is quashing those ideas you think are wrong. When argumentation fails to combat a competing idea, either because the idea actually has merit or because its proponents are unrelenting in their dogged adherence to it, few people possess the ability to just set the argument aside and move on. When there's a mechanism in place to censor those arguments, right or wrong, people will use it, justifying their censorship with all manner of rationalizations.
For example, lets consider something like the deservedly maligned Atheism+, a group ostensibly meant for atheists who care about social justice issues. At the heart of their charter is a divisive "us vs. them" mentality for anyone opposed to their exact ideology, complete with community expulsion and censorship of opposing views. I won't go into detail regarding their practices, since others have already done so, but I will pose this question: Is a movement so bent on communication controls really their to promote understanding, or domination?
Finally, while I don't necessarily think that Reddit will become something nearly so toxic as Atheism+, I think it's important to understand how Atheism+ got where it is, and understand that the principles that got it there don't have to be relegated to minor movements. Though I don't personally go there often, Reddit is important, and is important for several people. To undermine the foundations of free speech upon which it is built is to empower those seeking domination (who don't have to be governments), and it can happen faster and on a broader scale than many of us would care to consider.