I think the original version of that comic ended with the "even the passenger gets in trouble" and it was some sort of educational comic for teens. And no, it did not make much sense in the original form either.
OK, yeah, now I know I've seen this comic before.
What did those kids do wrong? For all I know, that cop's just a power-tripping asshole. If you wanna make an educational comic, it might help to explain things a little so the people who read it know what the hell's going on.