Which is why I commented more on vagueness (voiding laws for vagueness is a very old common law tradition). Stupid laws elsewhere are one thing. Vague laws are evil. Vague laws put people in jail on technicalities when people do not even know they are breaking them.
If California wanted a law that made sense, it could say no M rated games are to be sold to minors. That's another big government invasion, but it's a clear law, not without precedent, and easy enough to follow, just like laws against minors buying a 12 pack of Guinness or a pack of smokes.
I agree with your point about vague laws. Too bad Justice Scalia and most of the liberal justices didn’t toss out the law on those grounds. Justices Alito and Roberts apparently wanted to rule the law was too vague, and Justice Thomas would have been fine to join them on that basis.
What I don’t understand is how Justice Scalia, a man who has often bragged how he’d uphold a bad law so long as it wasn’t unconstitutional, threw out a bad law that was clearly constitutional.