Because that's how he gets his evil Satanic super powers; by absorbing the life force of his unwitting supporters from deep within their craniums, only to discard their lifeless bodies in his wake. He feeds on those who support him.
It's...it's all so clear to me now!
Visit Juliusblog for more great pictures of Bush molesting hairless men's scalps.
It's mega-creepy in a really delicious way!