I would have to say Hitler. He tried to wipe out an entire race. Actually, he tried to wipe out any race that didn’t look Aryan. When I go through genealogical records and I see entire families killed in the same year or even the same day, it breaks my heart.
On the other hand, I would love to bring Da Vinci and Ben Franklin back from the dead. Both great mind.
I have to mention Mel Gutièr and Deb as well, they’ve echoed my thoughts.
My Answer :
I would say Hitler too, because if it wasn’t for him we wouldn’t have had a Palestine/Israel issue , nor a reason for Al Qaeda / ISIS to exist , not even Donald Trump maybe.
Plus Julius Caesar; you might be intrigued by this but it’s true and it is a long story, for why I might write a post about it.