Yes, the epistemology of ID is screwy. Yes, they are annoying people who are doing our society more harm than good. No, I don't think the author of this post [via and via] (or the authors of several other variations thereof) are advocating violence against ID proponents.
But, funny as it is -- intense irony, of course -- this is precisely the kind of dehumanizing violent humor that so many of us on the left decry when it's displayed by the right. Is it exactly equivalent? No. But it's close enough that to let it pass would be splitting hairs, at best.
Laugh if you will, but be careful what you complain about in the future.