The main thing that you're missing is that people are social animals. That's how we've evolved, and why we have most of the cognitive biases/moral standpoints t

The main thing that you're missing is that people are social animals. That's how we've evolved, and why we have most of the cognitive biases/moral standpoints that we do (eg. punishing defectors/fairness/not killing other people for their stuff). This is Richard Dawkins' argument in a nutshell - you are essentially a paleolithic tribesman in a suit. If you prefer to look at it from a purely sociopathic amoral viewpoint, your ability to be a lone, rational actor is largely dependent on your interactions with society. You just have to look at people like Ted Kazcynski to see how completely independent actors live.