I'm not gonna exhaustively pick through the modlog but (a) I don't think she said exactly that, I think that's how you interpreted other things she said. If I'm wrong link me

(b) people of all different ages, backgrounds, and cultures mix online. People behave differently at different stages of life and people who come from worse environments or have worse peer groups are going to have internalised different things

(c) I am absolutely positive you have said some hurtful, ignorant, foolish, or poorly expressed things when hurting. People tend to not be their best.

(d) Not everyone experiencing suicidal thoughts is experiencing the same degree of pain or equally (un?)clear headed.

(e) many many people who self harm believe, genuinely, that it is a good solution. I have a shitload of carvings in my body some more and others less artistic because at a time in my life the only way I could feel joy was heroin or hours of pain. At certain points it can seem rational, and in a short timeline it can be exactly as rational as e.g. a suffering addict using a drug. Because it is bad advice does not mean it is malicious.