Not all human beings are nasty creatures. Even as Columbus was torturing, murdering and enslaving the very same native Americans who had saved him and his crews lives - Bartholomew De Las Casas were fighting to free them from slavery, get them equal rights and protection.
De Las Casas has, in later years by a more enlightened pope, been made the Patron Saint of Native Americans in the Catholic church.
At every time - there were people who tried to fight evil, who tried to defend the weak, who (with greater or lesser success) fought against greed and evil. 
And unlike you, I am confident I would in any time have been one of those. Because empathy and the recognition of the rights of ALL human beings as equal to myself is fundamentally who I am. Anybody who isn't like that can, inevitably, not be me.