Reason becuz he killed himself.
He kill the ones that made him, he blew up the others so he would be the only one left. He killed everyone in his path.
But when he saw himself in de puddle of water.. he noticed he was one of them aswell.. so he did what he was made to do.. to kill.. why would he be the thing he hates most!
you would drive MAD.
THE END :D!
i loved the movie ^^
liked the story
and enjoyd the killing ;]