As a kid, I had a book about a kid always asking "why?" and at some point, aliens came to conquer the earth. While everybody was freaked out, the kid just continued asking "why?". "To exploit earth's resources" "to conquer other words" "to exploit their resources too" "to conquer other galaxies" "to further our rule" "to conquer... well I see now that it's all meaningless and we go home now."
This is a story every child should read and don't ask me why, it just is.