I do all I can to convince them to not off themselves, and hope for the best. I'm not going to go ask bullies with guns to go force himself to do something he doesn't want to do under the threat of violence. That's what assholes and Democrats do. (Sorry for the redundancy)
I don't trust doctors either. Again, we know how the AMA as an organization feels about guns. My natural rights aren't subject to any other individual's discretion, no matter how "qualified" they are to judge me. If the person is really so unhinged and crazy that they are a legitimate threat to society, lock them up and/or institutionalize them as appropriate, which disarms them anyway. Otherwise, suicidal != homicidal, and it's not my place nor anyone else's to force them to do or not do anything.
SO, now your best friend is dead. Don't worry, you did your best....Suicidal people are not rational people. They are seriously mentally ill. If you can keep them alive long enough to get treatment, most will do quite well, and recover fully
Doctors do not equal the AMA. Some are gun grabbing lunatics. If you don't trust doctors in general, I feel bad for you.
There are a lot of slippery slopes here. I agree, having the gov confiscate firearms is not ideal. That opens a huge can of worms. Even if you can get your buddy into a mental health facility, it may impair his ability to buy regulated firearms in the future. I do see your points, and I think they are valid concerns.