We evolved the ability to think past our instincts, but not yet the ability to totally suppress or control them, generally. That is a source of conflict, partic

We evolved the ability to think past our instincts, but not yet the ability to totally suppress or control them, generally. That is a source of conflict, particularly when we build technology that, though useful and/or pleasurable, is frequently at odd with our long term mood and health. This is the unnatural/natural divide when it comes to human engineering. Think of it as hacking the human psyche, vs living closer to the primitives we evolved from. Don't forget that the human brain has existed for an exceedingly small amount of time in proportion to life overall; but many of our primitive psychological and physiological functions are many millions of years old.