Because you need a soul for that.
Oh, please. Like they've ever changed anything that needed it.
4yr: I need to wee! Me: With balloons ! 4yr: Its so much fun to wee with balloons
One has hope in her soul...
He whipped out his wand and yelled, "***Shtupify***!".
One had a horcrux, the other had a whorecrush..