I'm confused with your argument, you first questioned the type of parent that would let a kid out at 2am, but then said the ban sucked...?
It does suck.
nevertheless, a trusting and understanding parent will let their kid out at 2am. If you have a good, trustworthy kid going out with good, trustworthy friends, there is absolutely nothing wrong with letting them go see a band and go dancing with their friends on a weekend. It is a very productive release for people who enjoy that stuff.
The problem is not in the parenting. If the club claims not to serve alcohol to minors but does it anyway, and additionally puts its patrons in danger, it is not a place anyone should trust at 2am. But that's not the parents - that's lazy law enforcement.
Shows at the Black Cat run well into 2am all the time, but no one seems eager to gun up the place. And god be damned if anyone with Xed hands gets away with even sipping a drink in there. This is because it is a responsible venue. There is no point in punishing the responsible venues and the people that frequent them.