Humans are being born without appendixes.
if that's true, and I don't think it is, then it's because of human intervention (which doesn't count)
Our tail bone is getting smaller with each generation.
naturally
when you don't use your muscles, they get smaller
so, you'd expect that ok nevermind
but regardless, even other primates could use claws, if they had them, for killing, and other things
I don't think you can compare our tailbone to claws