Black market criminals tend to vote Republican, in the US. Organized crime is generally conservative, politically. Gun confiscation from citizens is as likely to be proposed by right wing authoritarians in the US (police, the imposers of martial law, the auxiliary forces such as Blackwater after Katrina, the enforcers of Jim Crow and similar legislation, etc) as left wing authoritarians. You trivialize depression and suicide by such cavalier treatment. As the numbers you have posted make clear, suicides are seldom impulsive in that shallow way you fantasize - remember the posted stat showing that suicides by gun rise in the weeks immediately after gun purchase? Suicides in the US normally obtain and maintain guns to commit suicide with, in preparation, much as they learn to make nooses or breathe gas, arrange times and places they will not be interrupted, give away valued possessions, find the best place on the best bridge or building to jump off, choose the place and circumstances of their car crash, etc. A person who is not planning to kill themselves with their gun is at very little risk of impulsively doing so. That ain't how it happens.