[spligak]

The argument for a persons "right to die" may hold up to some degree. However, I believe the spirit of that sort of protection applies to those who are terminally ill. The idea being able to preserve a persons dignity and shorten the time spent in excruciating pain.

Treatable mental illness: depression, anxiety, etc. do not fall into this category. They are not terminal.

Proximity to an instrument of death when a person is contemplating suicide (due to treatable mental illness) is a very real issue. If there is no barrier in place, the rate of change from thought to action is astonishing.

It's also important to note intoxication plays a role in this same sort of escalation.

In these cases you're looking for anything which increases access (proximity) or reduces inhibition (chemicals). Eliminating these gives professionals and loved ones time to help.