Some dude in 2020: You should not judge a historical figure, a man from the past, by the modern ethics! He was a product of his time. 500 years ago his actions were completely normal! It’s present-ism, we can’t judge… bla-bla-bla…
People from 500 years ago: Oh my, this guy is such a bastard, a genocidal butcher, a total piece of garbage. Let’s keep records of this douche so people from the future shall hate him too.
Columbus’s crew were writing about what a genocidal monster he was. There were mutinies and uprisings by his crews and colonists constantly. If his contemporaries were willing to risk the ire of the queen of Spain to oppose him, we have every right to call him out on it too.