There’s one big flaw in the whole “arms dealer” theory.
I just don’t believe you would load up a huge bunch of rifles and ammo, sneak them into a hotel with security cameras everywhere, and conduct an arms deal. The buyers then have to reverse the procedure and sneak the guns and ammo back out past the security cameras. Way too many chances of being seen and discovered.
An arms deal like this takes place in a warehouse somewhere, or out in the open desert, or at a safe house.
Way too risky to do it on the 32nd floor of a Las Vegas hotel.
Arms dealing gave him his money. Nothing to do with him killing supposed infidels. People that believe in the living GOD.
Yes the hotel security is very foggy in this case. Some say you can take whatever you want in there - no problem, and others say their security is so tight that will even check your premises when you are out of the room.
That would not have been a commercial arrangement in the hotel. Dealing arms would just be how he came by the money that his lifestyle required. It could have been drugs or prostitution or something else. Drugs and prostitution would probably produce participants or victims to accuse and claim. Arms dealing would not. He was obviously familiar with guns. It is an easy step to think that was his racket.