Please stop trashing Vegas as family unfriendly. It is family friendly. Its not the 80's.
https://en.m.wikipedia.org/wiki/Crossroads_of_America
Frequently suggested alternatives like Vegas, Orlando, etc. mean a much higher percentage of attendees will have to fly, and in most cases the cost of flying would more than outweigh the savings of cheaper hotel rates that another city might have.
I love Vegas, but it's silly to pretend that homeless people (which the Strip also has) are the equivalent nuisance level of porn slappers, at least in the eyes of conservative families. Given the choice between finding residual cigarette butts and the odd empty bottle in the street, and the cards of escorts, the rolling billboards selling escorts, etc., what do you think the typical parent will choose? Not to mention the kinds of behavior that go on with legalized outdoor open alcohol that is practiced by so many of the tourists.
And the solution "But you can avoid all that if you never, ever leave the complex!" isn't as big of a selling point to families as you might think.