> you can assume they'll tend towards evil.
An unnecessarily cynical take. What this is implying is that, in the absence of any morals, evil provides a selective advantage.
And yet, pro-social behavior has evolved many times independently through natural selection.
Evil confers an individual advantage. Pro-social behavior confers a group advantage. That's why sociopaths continue to walk along us. Society can tolerate a few of them, but only up to a point.
It's not that cynical when you consider that corporations exist precisely to shield owners and leadership from legal (and to a lesser extent) monetary responsibility.