Do you have any data to support that incarcerating someone via forceful removal of them from their home and creating a financial burden on them is an effective suicide prevention measure? It certainly doesn't feel self evident that is and it seems quite possible that it would have the opposite effect.

So that's why one might care.

Personal experience, if that counts as supporting data to you.

I spent a couple weeks in a mental hospital and was able to interact with a lot of amazing people who were dealing with all kinds of personal struggles. Not everyone was involuntarily committed, but many were, and for varying reasons. One guy was having a hard time dealing with the loss of his father and was involuntarily committed by his doctor. He left in a much better state than he arrived in after being there for only two days. Many people had similar outcomes.

If you only look at the uncomfortable nature of being removed from your home, or the dollars it costs you, sure, "No! This just equals more bad!" makes sense as an argument. But you can say the same thing about going on a vacation. The emotional benefit makes both the financial burden, and discomfort negligible in the big picture.

It is better to take care of emotional distress voluntarily, if you are able to do so, but if we are simply asking if it is effective as an extreme measure, yes it is, for many people.