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Let's see. Clearly, none of the people who think it "unhinged" to wish for Cheney's death - whether they are Howie Kurtz, or M. Malkin, or various liberals crying "this is only a few comments by unhinged people" - consider it "unhinged" to wish for a person's death. All of them, in fact, profess to wish Osama bin Laden dead - witness countless "why is Osama still alive?" posts etc.
Now, why would it be ok. to wish bin Laden dead, but not Cheney? It can't be because one is responsible for the murder of innocent people and the other isn't, since it's fairly obvious both are. Thus we are reduced to Malkin's/Howie's explanation: we shouldn't wish Cheney dead because he is an American official. In other words, we are just supposed to be nationalist or racist here. Now, that's what I would call "unhinged".
Personally, I don't wish for anyone's death. But I wouldn't really be very sad if either OBL or Cheney were gone.