that is because it is psychologically easier to commit suicide (or homicide) with a gun as opposed to an alternative
It is unclear how you could know this. Presumably, it would be psychologically very difficult to actually pull the trigger and for many reasons. The likelihood of success with a powerful enough caliber weapon aimed at your temple is very high, so the (usually male) person would suspect this. He would know the finality of the act, which could make it a psychologically difficult decision. He would also anticipate substantial pain right before death, which also presumably doesn’t assist him, psychologically.
There are various categories of
attempts that groups keeps stats on. I’m not sure how one would assess whether it was psychologically easier to hang oneself, shoot oneself, fall to a hard surface from an extreme height, poison oneself, etc. I could see how various attempts to make yourself pass out such that you would die in your sleep might be psychologically easier (e.g., carbon monoxide poisoning in one’s garage).
I’m also unclear how Vox or anyone else could judge that America’s “greatest gun problem” is suicide by self-inflicted gunshot wound.
Most everyone would assume that the alleviation of extreme suffering is a good reasonably sought by humans. Suicide is an ultimate attempt to alleviate extreme suffering. I would also take it as obvious that most humans believe that homicide is a greater evil than suicide in that homicide necessarily has victim(s) besides the shooter.
Also, as others have pointed out above, having access to more effective tools for committing suicide is well beside the point. If someone has reached the internal place where he believes that life simply isn’t worth living, then that is what needs to be addressed–that he no longer finds life worth living. Taking weapons away from him might simply have him look elsewhere for effective tools. It would in no way address the core problem that the person is looking for his early exit. And if he looks hard enough, he will find it, whether or not a gun is involved.