Because he didn't agree with the creationists, he must be. That's the only alternative, apparently.
Well the Left surely likes his decision, as would any objective person, Left or Right. But these personal physical attacks I am sure have the Left Wing Press laughing and saying "Keep 'em coming - just shows you that if you don't toe the Cr/ID line you're open to vilification and physical threats (in the Kansas Prof's case, physical attacks)."
Yeh, great image for American Conservatives.