Mostly OT: Isn't the phrase "What happens in X stays in X" more closely associated with Las Vegas, which must be one of the most heavily surveilled cities in America? https://lasvegassun.com/youre-being-watched/
I always interpreted the tag line to be more about the social acceptance of what would be considered deviant behavior elsewhere.
Yes. The implication is come to Vegas and do wild stuff with no one at home the wiser. The contra is a favorite t-shirt I’ve seen at the airport: What happens in Vegas stays on Facebook and YouTube forever :-)
In addition to large amounts of surveillance, the Las Vegas Metropolitan Police Department (LVMPD) has regularly been featured on Cops and Vegas Strip [0]. So pretty much the exact opposite of the Las Vegas slogan.