Suggesting that you put someone in a "rubber room" is a bit ridiculous, but it's normal to put someone that is suicidal under suicide watch. Keep in mind that mental health can be a huge factor in someone being suicidal. In other words, they're not thinking straight, so it's fair to help them during that time.
Having the right to end your life is different than others trying to help you through a challenging time and show you that there are other ways out.