Sure, but then you’ve got the problem of a bunch of suicidal people feeding off each other, which isn’t healthy for anyone.

There are communities like !mentalhealth@lemmy.world and !autism@lemmy.world that I think work better. They aren’t aimed at suicidal people directly (in fact I think they have rules barring suicide talk entirely), but encourage discussion and support for specific issues. There’s an attitude of “here’s a problem I’m having, how do I fix it/let me vent”, rather than doomposting.