No idea. I'll guess h) any of the above, although from what I remember of history e) didn't affect that many people.

Do you have a link to articles on their site supporting denial of the holocaust? I just looked and didn't see any, but I'd never heard of Indymedia until this incident.
I'm inclined to sign this petition in any case, because free speech doesn't mean much if it's restricted only to speech I like. I haven't signed it yet because I know so little about Indymedia.