I am not exactly sure how the voting itself was supposed to work. Butler got more points than Tatum (who did have more than Kyrie). But for instance Embiid had more points than Kawhi Leonard, and was eligible at and C, but Leonard made first team over Embiid (presumably most of Embiids points came as a C)
Anyway, I think Butler was awesome this year and voting for him over Tatum doesnt really seem that ridiculous to me. Butler did play fewer games, and he didnt score as much, but he scored more efficiently, was a much better passer (he averaged over 7 assists per game!) and is a beast on defense.
(I bet Julius Randle was real happy the voting was done before the playoffs)