Harun Yahya really doesn't have much presence outside the Islamic comunities. And what I've seen of his seems to recycle the same old rubbish Christian creationists use. Scary he might be, but how scary is he compared to Al-Qaeda ?
Really I think it is better for everybody right now if the fight against him is focussed within the Islamic community. There is enough hostility between Muslims and Western society already. If westerners attack Harun Yahya he'll likely use that to propaganda effect, using it to mear his Muslim opponents, too. If western society finds out more about Harun Yahya some of our more intolerant elements will probably use his existence as anti-Muslim propaganda. Looks like a no-win situation.