Kill and kill again?

The Las Vegas shooter, Stephen Paddock, was insane. I think we can all agree on that. He acted on a desire to kill as many people as possible. I think that we can all agree that it was not the act of slaughtering all of those people, but the desire to do so that qualified him as insane. Obviously, he had the arsenal necessary to carry out his desire. And having an arsenal of that size proves that he had the desire to inflict that much carnage. So, did the desire to commit such carnage cause him to amass all those weapons, or did the amassing of all those weapons give him the desire to use them in the way that he did? I think that question answers itself.
And therein lies the problem. A person must be insane to amass such an arsenal. Such a person must possess a belief that there is such an imminent threat just outside his front door that this much firepower is a rational response. This, of course, is delusional, and people like this should not be allowed to purchase or possess any type of firearm.
And therein lies the problem. Thousands, perhaps millions, of Americans--almost exclusively white, almost exclusively male--believe exactly this: there is, indeed, such a threat just around every corner, and that no personal arsenal can ever be big enough. To be unarmed--no, not to have the superior firepower to defeat any enemy--is foolishness to them that borders on the unpatriotic. There will be, there can be no discussion about guns in America as long as a significant percent of the population is deluded into believing that they are not insane and, hence, unfit to possess guns, when, in fact, they are.
Women who become obsessed with their outward appearance are often asked to pursue psychological evaluations before obtaining further cosmetic surgeries. Perhaps it is time for the same thinking to be applied to those who just can't have enough guns.