What kind of answer is that? at least Madara,Nagato,Sasuke, and Obito had the balls to say they were evil.
I don't get all the things i heard about Tobiama where good things like how he sacrificed his life to save his comrades or how he had the Will of Fire and risk everything for his Village and it's people, but why would such a man create such an evil Jutsu that would disrespect the dead? don't start flaming me when i say this, but Tobirama is such an evil bastard in the inside there is more than meets the eye about this guy... truly
necrophilia seem to be the most logical answer.