Not Black & White
As a few posters have mentioned already, it's not as easy as turning off the epileptic seizure sections in the game. For one there are many types of ways that one can get a seizure, not to mention that some are more sensitive than others.
And it's not as simple as testing the game and removing the sections that probably will cause them still doesn't guarantee that it won't cause seizures anymore. There's always the possibility that the game will cause a seizure because of an abnormality in coding.
I rather see a rating system that judges the possibility of a seizure. There's some definite things that will cause a seizure, so the company can base their scale on that.
But in all reality, those who know they have it, or a family history of it, are smart enough to know that they are taking a risk every time they play a game. They can't blame the company because no one forces them to play the game in the first place.