There is no doubt many believe that Christopher Columbus was a murderer and committed genocide on the indigenous people who inhabited the Carribean back then: The Taíno. The fact is we just don't know much about his first voyage. The only records kept were by the man himself, in his personal log stored in his cabin on the Santa Maria.
We also know this. The Taíno — the wonderful people who invented canoes, the hammock, who loved to barbecue and smoke tobacco and dealt with hurricanes long before Columbus showed up — pretty much disappeared from the earth 50 years later.
Hopefully, I can put you inside Columbus's brain and body as you read this novel. No doubt that he was a brave, courageous see captain, awarded admiral status because of the dangers and risks he took.
We can look back through history and provide today's standards to any event, good or bad, that took place. But unless you are in the mind and body; unless you experience what the world was like at the time, it's difficult to make an educated judgment.