>Maybe it's more that Facebook thinks it's horrible when people kill themselves, and that if Facebook's tech could help prevent suicide, inaction would be immoral.

That doesn't entirely contradict what I said. We generally assume psychologists and therapists are benevolent, but they aren't allowed to disclose private information even if it's in the best interests of the patient. Even if we assume Facebook is perfectly benevolent, this kind of vigilante psychology with no oversight is scary. They've thrown out all established codes of ethics in favor of just doing whatever the hell they want.

And I'm certain Facebook isn't benevolent. They deliberately make their website as addictive as possible. They have run experiments that tried to make people unhappy. If this really is a selfless attempt to help their users, it's inconsistent with what Facebook has done before.