Also because if you squish the rights of one thing, it's easier to squish the rights of another. If video games are legally bound by ratings, then now you've got precedent for movies, tv, books, etc.
First they came for the videogames
and i didn't speak out because GOOD. FUCK VIDEOGAMES.
I hope they ban Solatorobo from ever being finished.
YEAH, IT'S YOU AND OPAQUE FOR BEING OFF-TOPIC.
On-topic: This doesn't mean anything to you and it never will, since you're not under 18 and since the idea of banning something is absurd after comicbooks in the 60's or whenever they did that burning thing.
Look up "weh weh weh weh". People like to cry about restriction of free speech, but this is a real stretch. California wants money, finds an easy target.
It's not a hard concept to follow. If every copy of an M-rated (scratch that, "violent" - the law in question wasn't even tied to ratings) game represents a potential $1000 fine if the 22-year-old clerk who doesn't care about his minimum wage job slips and sells one to a kid (and we're talking here about items where the store's profit margin is about $10, so one such fine negates 100 sales), no store in its right mind is going to carry them. Which means they stop getting made. Which means even adults can't play them. WHICH MEANS WE'RE AFFECTED OMGWTF
This is the same reason movie ratings aren't enforced by law.