Good. Parents need to make that decision, not the state. I remember this crap from when I was a teenager. It teaches you to look at any authority as a threat. It teaches you to not trust or support law enforcement.
(A little French lingo there to show I bear no prejudice against frogs.)
Of course being a Libertarian you would feel that way.
In today's society, practically half of America's parents (the ones who vote for DemocRATs and Libertarians) haven't got the sense God gave a cucumber. They're so busy procreating, slurping suds, sucking on a cigaret or mj, watching weeks of mindless crap on their tv that they haven't a clue as to where their little potential robbers and killers are hanging out.
Polite society needs protection against these little weasels until they're old enough to commit major crimes and get free room and board in the slammer.
I'll bet you were a dandy teen and look: you've grown up to hate law enforcement.
So young kids aren't supposed to have a healthy fear of authority figures, specifically police officers? That's the reason these curfew laws were put in place to begin with. We 'are' a society with too many youth that exhibit total disregard for laws and the authorities who enforce those laws.