Update: PhilGoetz was the one who gave me the idea, in what was a quite reviled top-level post. But interestingly enough, in that thread, Eliezer_Yudkowsky said that his decision theory would have him take revenge, and for the same reason that he would one-box!

And here's my remark showing my appreciation for PhilGoetz's insight at the time. And under-rated post on his part, I think...