"Societal decay?" Way too broad of a concept to even be useful. I would also argue that "societal decay" is what the older generation always thinks the younger generation is bringing about in era after era after era. Plato thought the younger generation of his time was engaged in "societal decay." And so it goes.
The guy makes some good points, especially the one about the riots in L.A. How does a free society guard itself against psychos? Who knows? Would the shopkeepers in L.A. have been able to hold off rioters with shotguns? Probably. Does anybody really need 30 round clips and armor piercing ammo?