If your permanent neighbor has a loud party, you can talk to them about it the next day, and there's a decent chance you can come to an accommodation, since they have to live next to you too.
If a transient neighbor is too loud, you have no "social" recourse, because they have no incentive to accommodate you.
In addition to bcbrown's comment, trust/security is a factor. Neighbors may allow their kids to play in the hallway or go down to the lobby and check the mail on their own. But if there's a sense that the neighbors aren't known, then parents may feel uneasy about it.
