Do all humans lie. Yes. Like so many other things it's a continuum. Pathological lying is a foundational component to psychopaths/sociopaths/narcissists. It's lying on steroids. There is a huge difference. I often tell patients that dishonesty or selective recall/expression of the truth may have a temporary gain for them but the path they are paving away from their true self will increasingly make it difficult for them to experience genuine contentment, real intimacy and greatly increase their risks for major drama the more comfortable they get with placing dishonesty bricks in the path. Psychopaths/sociopaths/narcissists have vaccuous emotional selves, thus they don't emotionally "get" the reason to abstain from their rabid dishonesty. In fact it is quite the opposite, they use it as a great skill set by which to acheive their objectives and to plunder/exploit those around them.