Yes, if we had considered ethics in the past, we wouldn't have committed bloody genocide on the Native Americans. We would probably have tried to open up mutually beneficial trade with them. (Sadly, we probably would still have caused the deaths of millions of them simply due to pathogens we didn't know we were carrying when we met them.) Do you think that would have made things worse now?
> In my moral framework, the worst (i.e. greediest, most selfish, anti-social) people have been winning over the last 20-40 years.
This sounds an awful lot like a "might makes right" attitude: "Sure, they're awful people, but they're winning, so we should adhere to their values!"