When a normal person gets into a dispute, they worry about saving face and moral obligations, instinctively comfort (or maybe attack) the other person, etc, in an "I-Thou" situation. But a psychopath just sees a dispute as an "I-It" situation, like seeing a puddle on the sidewalk, something to casually (or carefully) navigate around, or (in the worst case) plow through and brush off.
http://en.wikipedia.org/wiki/I_and_Thou http://en.wikipedia.org/wiki/Martin_Buber
No. I, and I suspect most ambitious people, also desire power, control, and have inflated egos to some extent. Psychopaths are still human (though broken) and also have these traits, but since they lack other traits like compassion, generosity, etc., the former tend to show through more.
One thing you can say about the human mind is that there's nothing binary about it.
It's hard though to differentiate true psychopaths from those who simply share a few traits. When I read about psychopaths, I tend to find common traits within myself. I can't tell if I'm a psychopath or not. Are those who desire power, control, and inflated egos always psychopaths? Or do psychopaths just happen to always have that in common? Regarding myself for example, I may dream big and make promises that take time to meet, but I'm not a liar and I don't actively manipulate people for selfish gain; and I do crave power, control, and prestige, but not for the sake of it; I just know that those three characteristics are required to make some kind of real impact on the world that truly improves lives; and I've come to realize that if I want something to be done, I can't always rely on others to do it, so being in a respectable position of power and control is almost certainly required. Does that make me a psychopath?