YMB...surely the point here is that he obtained at least some of these weapons completely legally.
Yes, of course criminals can get their hands on weapons here in Britain, but not legally. The gun laws in some American States are so lax, or to use a word that Americans hate, liberal, that he was allowed too repeatedly buy weapons and ammunition that is totally inappropriate for any normal persons needs.
There may be 1000's of nutters like Paddock, probably 10,000's, just waiting for the opportunity to do what he has done.
The future for America is chilling.