As I tried to make clear, above, anyone can believe anything they like; and after all, ignorance isn't a crime (or a sin!). But, what really worries me is that this whole ID thing comes from religious fundamentalists and history teaches us that such people won't stop at giving ID equal time with evolutionary theory in American schools. The next thing you know they'll want ID to be taught exclusively and then they'll be burning heretics who support the Theory of Evolution.
Basically, any group which claims to have exclusive access to 'the truth' is potentially dangerous and should be resisted.