Actually, thinking about it, this is closer to the best possible attitude people can take about violent games falling into the hands of minors. Years ago, people wanted GTA banned because they didn't want it to negatively affect children, but we said 'Hey, if there's a kid who would actually do the stuff they see in this game, maybe it should fall to the parents who let them play it; maybe parents should take a bit more responsibility when it comes to the video games their children play."
But while these schools are, indeed, asking that parents show some responsibility with the games their kids play, they are taking it waaaaaayyyyyyy too far. Let the parents determine what their child can handle in terms of content, and don't make a fool of yourself by calling the cops if they make a decision you don't agree with.
I mean, I'm not a religious person, so I won't be having religion underline how I raise my child, but that doesn't mean I'll call the cops just because my neighbors next door raising their child with the Bible in mind.