Oh wow.
First of all, there isn't some magically subliminal light in programs and games that cause seizures. I don't even think that can be done. It would require actually tapping into the TV.
Second of all, seizures will only occur in people who are prone to them. Not every kid is going to get a seizure and not every kid who gets seizures is going to get one from the same thing. This reminds me of some kid who died on the right Alien at Disneyland and everyone thought it was the ride that did it and had a freak out. Really, no one can measure everyones' reaction, there's no way. Eventually, someone is going to die from everything if it exists long enough.
Third of all, video games have seizure warnings. They're pretty well posted. Oh wait, you just want to censor video games. This guy is actually a little clever. Instead of outright saying "Let's ban violent video games", he's going to use the "video games cause seizures card" and then if he gets his way get a bunch of crackpots to start saying blood, curse words and titties cause seizures.
Lastly, this doesn't happen that often. It's slightly more common than winning the lottery and slightly less common than an intelligent U.S. President. Remember the whole Disneyland ride thing. Yeah, people die at theme parks way more often than people die of video game seizures. But I'm pretty sure no one is trying to shut down all rides more epic than it's a small world. This obviously has secondary motivation behind it. Just suing video games, ALL video games, based essentially on one kid who had a seizure? No, I have if you look at this guys' track record you'll see he graduated from the Jack Thompson School of Law.
It should also be noted that kids don't just HAVE seizures. Here's what is common practice with kids biologically - colds, the flu, chickenpox, and other natural illnesses. Seizures? Not so much. Generally, kids are prone to them and if they're PRONE to them, a doctor will usually tell you ahead of time. Unless you're too busy buying your kids video games to see a doctor. And really, if the doctor says "your child has very sensitive vision" and then you sit them down to a game like Spyro, which is very bright, and flashy, you might as well just blink the lights on and off really fast.