Sounds kinda like Columbus. He's a hero who discovered the New World but also a genocidal maniac
Nonviolence was key to Edison's moral views, and when asked to serve as a naval consultant for World War I, he specified he would work only on defensive weapons and later noted, "I am proud of the fact that I never invented weapons to kill." Edison's philosophy of nonviolence extended to animals as well, about which he stated: "Nonviolence leads to the highest ethics, which is the goal of all evolution. Until we stop harming all other living beings, we are still savages.
Ah.. found the reason for that. March 11, 2013 Epic Rap Battles of History released Tesla vs Edison.
"Mum and dad wanted to name their son after Thomas Edison, inventor of the light bulb, but made an error registering his birth"
While we're at it, Cristiano Ronaldo was named after Ronald Reagan, you can add that to presidential quiz :)