From a why mock the suicidal thread:
I think some Dopers who would otherwise be sympathetic or at least neutral become “dicks” when they see the kindest hearted Dopers being spun tales of poverty and woe, and feel they are being taken advantage of.
I think seeing threads that attempt to skirt the rules about no unapproved appeals for donations by posing as a request for more information on how to get approval make some Dopers question the integrity of the poster.
I think details that don’t seem to add up make some Dopers question the authenticity of what they’re being told.
I think threads that are subsequently started by the poster under suspicion about her fragile mental state are viewed as an attempt emotionally blackmail the doubting Dopers into leaving the holes in her story alone.
I think that a suicidal Doper is someone who automatically gets sympathy, unless they’re setting off warning bells for other Dopers who’ve encountered sympathy trolls and scammers before.