Well damn, is that starving kid in Africa gonna come over here and unfuck my brain chemistry?
All it does is bring shame and discomfort to the person who's having those feelings. "Like I didn't feel bad enough already, now I know I'm a selfish piece of shit..." Maybe it's effective on people who are inherently non-suicidal and going through a frustrated period but who say they will CTB without intent -- but for the majority of cases it's so stupid. Not everyone has the same level of resilience. Besides, isn't the oft-repeated quote, "Be kind, for everyone is going through a horrible struggle"? Suddenly they're not...?