When you see a sitting arb or a fellow candidate go after someone that hard, that's probably their way of saying that no matter what happens, they think this person is grossly unqualified to be an arb, and no matter how it looks they want everyone to know it.
I did basically the same thing to Calidum, basically asked a question that he couldn't answer without admitting he'd acted in an absolutely terrible manner, abused rollback, and called another editor "faggot" (all at the same time) and somehow got off with just a short block instead of an indef. I never expected him to get elected, but some folks might've supported him just for being an outsider, and they had a right to know about this, in particular since he straight-up lied about it when answering a previous question about his block log.
The GW/Kudpung thing was painful to watch the first time around, unlike some of you I don't think Kudpung is such a horrible person, but there's no doubt he was on the wrong side in that incident. The smart move would probably have been to just ignore the question, or at least give a more conciliatory reply, but he went completely the other way and played right into GW's agenda. I don't think he was a particular strong candidate to begin with, but this certainly didn't help his case.