From the managers I talked to, it's the extra work and damage, the glitter and spray tans just stood out. Many parents giving free rein to their kids and silly stuff like pressing every button on the elevator board slowing down their staff. Many parents leaving their sleeping kids to go to the lobby bar, getting complaints from surrounding rooms on what sounds to be terrified screaming/crying children somewhere. Many parents leaving their older kids to watch the younger kids while they go to the lobby bar not realizing the older kids plan their own little parties, and laugh, talk, and empty the mini bar (only to have parents deny this would ever happen and dispute the charges and complaints received). They said anytime you get a large population of adults with kids that know each other, there are many adults that use poor judgment so they can socialize, and trust that their normally well behaved child will act accordingly with other unsupervised kids.
I will, also, share what I learned from a parent in the hotel industry. She said because of the high tax revenue hotels, malls, and amusement parks generate, you rarely hear of the crime that goes on in these places. She said these places employ a large percentage of non and broken English speaking employees that can't assist young children when they ask for help. I will just leave it at, parents, we all need to stop being so trusting. She said these criminals know these are the places we allow our kids to roam freely and our kids will break off from their group to use the restroom, get a snack, etc. and these criminals count on it.