we have had to have our son involuntarily hospitalized several times, but only when he is a danger to others. he becomes very paranoid & thinks he is acting defensively, but he can be very dangerous to others, especially his family & closest friends.
we think there is no choice in such cases, unless you think he'd be better off in gaol.
we admit to having tried to have him hospitalized when he said he was going to jump under a train

but the hospital released him & had him driven to a railway station
if someone really wants to die there is no way to stop them, suicidal ideation is a completely different problem & there is no reason to admit such people to a hospital & waste the hospital beds which are urgently needed for critical cases.