I'm pretty sure he's blaming Utah for minors buying M rated video games. Lunatic definitely, but the online porn bit seems to be a simple ad hominem attack. They're complaining because he's sending them porn, so instead of not sending porn, he's accusing them of liking the video games because Utah's just a bunch of porn addicts. It's not the first time he's done it. See here. It's pretty common among the religious crazies(for those of you who are liberal crazies, these are crazies specifically, not everyone religious), and nothing new to Thompson. Rock music for instance, you're a devil worshipping witch that eats babies if you listen to Metallica. Or if you watch Harry Potter or Disney movies. He's pretty mild really, at least it's a stretch to get from his view on the games to where reality is actually at. He does seem to have his own special idiocy when it comes to the reaction though, I'd be worried about the safety of his neighbors if he started harping on witch craft.
We really don't need some guy getting torched on his own lawn because his kid had a Harry Potter costume at Halloween...