I mean, you can't advocate for people to kill themselves.
It doesn't matter if you say kys for world peace, even if it was true and someone was sacrificing themselves for the world.
Just can't say that.
Usually you can use euphemisms though.
But yeah Reddit is shit I got similarly banned, but for even milder language, when — I assume — Israeli's mass flagged my comment, and I had had previous warnings over similar things.
It doesn't really even matter though if you use even mild language if the intent is there and some astroturfing group decides to mass report a comment.
When it's like dozens of reports on a single comment, the lazy fuckers over at Reddit simply don't care and ban you.