Why is it immoral that a female be born from the tree?

It’s not immoral being born from the tree, but it would be loving said female because the elf would be a sister to the men. At least, that’s my impression of the vague answer since all of the male elves are also born from the tree. Hopefully that makes sense.

Oooh that's true, makes more sense now. I didn't see them as siblings I guess.