one to provide an outlet for people’s unpleasant/destructive thoughts (sometimes voicing them will help temporarily quiet them if you are in acute distress).

That sounds like a problematic issue, reddit already has a problem with communities for support where "ppl who suck at X give advice to other people who suck at X). These types of communities might reinforce unhealthy attitudes, I suggest you at least link to sources that have at least trained volunteers (my country have those, and the US probably also has it), maybe also links to other resources like free online CBT/ACT therapy resources or books.