I think a kid deserves their parents' trust until he blows it. If the kid is getting into trouble then the parents should check that the kid isn't doing something stupid.
For example, a kid at my school is a real idiot. He's in all the slow classes and he drinks and smokes. He is actually a nice kid though. That's not the point. He stole his parents' credit card and gambled away $2,500 or something like that playing online poker. Number 1, you really have to suck to blow that much, lol. Number 2, he is the type of kid to check on.