Talk politics.

What was "anyone" supposed to do? He didn't bring them in full view, obviously. The were probably disassembled, packed in a generic suitcase, and brought in one at a time over a long period. If he kept them that way, how would anyone even know? How could they know? Housekeeping changes the towels, they make the bed, they empty the wastepaper basket. They don't search your luggage. If the housekeeper had walked into the room and found a dozen rifles laying around the room and thousands or rounds of ammo, I guarantee you they would have reported it. They likely already have policies that require staff to report suspicious or illegal evidence found in rooms.

I suspect in the future, places like Mandalay Bay will have metal detectors and bag searches, but in the world before this massacre, that wasn't considered necessary. In hindsight, was that stupid? In hindsight, everything that could have prevented a tragedy looks stupid.

It wasn't love of guns that did this. It was hatred of people.