Censorship increases homogeneity, because it reduces the amount of ideas and opinions that are allowed to be expressed. The only resilience that comes from restricting people's speech is resilience of the people in power.
Humanity itself is trending more toward monoculture socially; I like a lot of things (and hate some) about the cultural trend. But what I like isn't very important, because I might be totally wrong in my likes; if only my likes dominated, the world would be a much less resilient place -- vulnerable to the weaknesses of whatever it is I like.
So, again, I propose for the race as a whole, broad cultural diversity is really critical, and worth protecting. Even if we really hate some of the forms it takes.