Why should we think that he’s being jerkish when he’s offered a similar chance and explicitly turns it down, when we didn’t mind him implicitly turning down a thousand such chances before?
Because most humans don’t utility-maximize like Harry, and so their implicit choices don’t predict what they’ll do when faced with an explicit choice. And when one is considering whether to befriend or ally with someone, it’s the explicit choices that would matter from then on; one would no longer be anonymous to them.
Because most humans don’t utility-maximize like Harry, and so their implicit choices don’t predict what they’ll do when faced with an explicit choice. And when one is considering whether to befriend or ally with someone, it’s the explicit choices that would matter from then on; one would no longer be anonymous to them.