The problem is that not all game shops follow on the policy. Selling cigarrettes and alcohol to minors is ilegal, not just a policy of the companies.
And why exactly does everything have to have a law about it? IMO, the Court is right when it decides against unnecessary legislation, it just drags the whole system down. The industry policy is working fine for the most part, and the issue is really not so serious as to require a law on the books.
Plus, there's a reason why alcohol and cigarettes are illegal for minors, and M-rated movies and games aren't. You seem to be implying the same level of harm, but the effects aren't even comparable at all. Alcohol and drugs are medically proven to be harmful to health; mature content isn't.
Finally, it's a personal choice, and it's a responsibility of the parents that the government shouldn't intrude. It's their choice how to bring up the child, and if the kid can just go and buy whatever without supervision, then that lack of control is the parents' choice as well. Personally, the whole push for legal regulation on every social issue in the States is still making me roll my eyes. Do Americans value freedom so much that they want to restrict it at every corner?
As for political value of this decision, I'd say it's nil other than for the parties concern. Had it been highly controversial, the vote wouldn't have been 7-2. Seems more like a throwaway non-issue case to me.
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Looking at the CNN article, caught the quote from Breyer's dissent:
"The First Amendment does not disable government from helping parents make such a choice here -- a choice not to have their children buy extremely violent, interactive games,"
Ignoring the number of double-negatives, try to re-read that and think it through. Still makes sense? Nope. He tries to imply that violent games are as bad or worse than pornography, and suggests that the case is about education not censorship, and about the government helping parents make the right choice. More like the "only choice" if he had his way. If that's not the way to censorship then I don't know what is.
With that being the best the dissenters have to offer (well, we also have Thomas, but we all know what he wrote - his usual extreme conservative textualist interpretation that even Scalia didn't agree with here - not really worth mentioning), I find this case being quite silly and obvious. The
funniest thing is, though, if you read the CNN article, how self-righteous they try to appear criticizing the Court for making the decision. Gotta love it when the journalism's effort to appeal to the target base defies common sense