Only worrying about the desires of current people seems, for lack of a better word, prejudice.

Also, it opens the question of people are spacelike events. Do they count as past, or future? For that matter, what about people who you control acausally? If you count them, should you try to desire something people used to have, on the basis that they're similar to you, which makes them more likely for them to have desired it? If you don't, didn't you just eliminate everyone?