>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.

Using the mental health angle to deny someone their most basic right is fraught with issues. Mental health is often defined in terms of conforming to the standard behavior under various measures. We define mentally unhealthy as sufficiently deviant behavior and use that as a rationale for restricting that behavior. This is a thinly veiled attempt at forcing conformity under a scientific premise. Unless one can be demonstrated to be out of touch with reality, we have no right to physically intervene with someone exercising their right to self-determination. If you believe this right has caveats, then you simply never believed in it to begin with.