If intelligent design itself was responsible for drawing a demographic from all across a continent and destroying an estimated 6 million of them in an attempt to exterminate them completely, and was associated with a larger movement that was ultimately responsible for the deaths of 50 million people, then yes, I wouldn't have a problem with outlawing it to prevent a resurgence.

> But Germany and Austria do the same.

Yeah, one each according to that WP link. Irving was imprisoned for all of 13 months in Austria. Compare to the recent HN article on Rikers Island in New York where 400 people have been imprisoned for more than two years without being charged, and suddenly the extremly low conviction numbers of these "political dissidents" comes into focus.

Also, classing holocaust denial as 'anti-government messages' is a pretty gross mischaracterisation.

Seperatist muslims in Xinjang, anti-government rebels in Egypt or Nazi sympathisers in countryside Germany. They're all people sharing ideas that can lead them to violence. It's not reasonable to pick one of them and class it as "truly worth suppressing their speech" while accusing governments which suppress the others of violating human rights.

Intelligent Design did kill millions of people native to the Americas.

Also, this: http://imgur.com/hQ9Lyey