Really shitty scenes and situation. Got a mate and his gf out there at the moment, staying next door at Luxor. Think its her first time to Vegas so can't imagine she'll be in a rush to return.
I've been 6 times since 2011, love the place. Sadly, I've often thought it's ripe for something like this; always thousands of people kicking about whatever time of day it is, the fact you can wander in and out of all the hotels at your leisure. If someone did manage to detonate an explosive, or just open fire as per last night, the results would be, and are, dire.
I've never seen any trouble on my visits. There is always a decent presence of police and security on the strip 24/7, and all the hotels have their own in house security teams too. Just as its pretty hard to stop someone renting a van and driving on a pavement, with their gun laws so relaxed its pretty tough to stop someone doing something like this if they are hell bent on causing destruction.
Sadly I don't see things changing any time soon as the NRA seem to hold so much power and political sway over there.