Joking aside, this is kind of an issue in real life. I help mod and participate in a forum where, well, depressed/suicidal people can come to talk, other people can talk to them/listen/etc, try to calm them down or get them to get psychiatric help if appropriate, etc... (deliberately omitting link unless you knowingly ask for it, since, to borrow a phrase you've used, it's the sort of place that can break your heart six ways before breakfast).

Anyways sometimes trolls show up. Well, "troll" is too weak a word in this case. Predators who go after the vulnerable and try to push them that much farther. Given the nature if it, with anonymity and such, it's kind of hard to say, but it's quite possible we've lost some people because of those sorts of predators.

(Also, there've even been court cases and convictions against such "suicide predators", even.)