. . . sometimes called the envy gene.
I am no good at envy. It is exhausting to be envious, and I am simply too lazy to fall into that trap. On the other hand, I am not much of a pessimist, but the optimism gene also eludes me since I have a realistic streak a mile wide, I realize that people are human, and will sometimes try and screw me.
I would guess I am part of the undefinable 10%. I am commonly optimistic, but wary, seldom pessimistic, but again wary. I trust but only after I have had time to verify the character of the person, this can take some time. I was never very envious.
I suspect most of my lack of envy was based on the fact that I always believed I would land on my feet, regardless of the difficulties. And, mostly, I did. I live a "make my own luck" life, and it works pretty well.
But the entire progressive schtick is envy, the desire to get another to pay for what one wants. It is an ugly ideology.