37signals did research on this. For a respectful community, start with a difficult-to-attain, invite-only profile where a person has to show a real, verified profile pic and post their also verified name. More like ASW. Anonymous positing is useful for exposing misdeeds of power or be more honest than one would otherwise self-censor; anonymity is no panacea either.

"Safe-space" utopias never scale: there will be SJW bickering and whining and/or extreme self-censorship which will lead to an extremely boring (and irrelevant) platform. Plus, online platforms never have to guarantee free speech... they're businesses and organizations which can choose to do just about whatever they like within various, regional legal limits.