For my part, though, what comes to mind is that churches I've attended, including the one I'm a member of now, have security teams whose task is to wander around the building while it's being used to watch for things going awry. My pastors simply know that if things get out of hand, people simply won't come back.
And as such, it strikes me that if the hotel in Las Vegas had had the same kind of thing going on, the police likely would have found the shooter much more quickly, possibly saving a number of lives. Yes, you've got the cultural issue of "what happens in Vegas stays in Vegas" and all that, but on the flip side, the city can only afford so many disasters before people start
Really, if sending a hotel employee to discreetly walk through the halls every 10-15 minutes would put that much of a crimp in their style, that's all the more reason to do so.