He made no contributions to make the world a better place. Instead he opened the door to the destruction and exploitation of humans by other humans. Not necessarily his fault.
I think that all of us, had on a way or another benefited from the discoveries, this Continent eventually became quite different from the European ancestors and in some respects I think that it has produced most of the rights and liberties associated with modern society.
The savagery and domination of the natives was no different that the Biblical tales about Israel and the Canaanites.
We have to put things in perspective and just think at the alternatives, at any rate we can't change history.