It's probably too late now - Pandora's box has been opened - but just in the US, about one school shooting or mass shooting every two days proves that at least one member of the species isn't uniformly ready to have firearms.
Assuming for a moment that sanctioned warfare is justifiable, in peacetime we have at least managed to build a political and military apparatus that has generally kept nuclear, conventional explosive, and chemical/biological weapons out of the control of the subset of the species who are vulnerable to this sort of psychotic breakdown.
Syncophantic AI chat bots are already making this weakness worse.