Most people know how to behave. They know from education and experience that if you act kind and charitable towards people you meet, you will get friends and services in return. It’s called reciprocal altruism and it continues only as long as it yields results.
I have known plenty of people who seem like “good people” but at occasional moments, when they are not watching themselves, they show their true colors. I used to believe that humanity was generally decent. Not anymore. I don’t even include myself as one of the decent ones.
I'm somewhat puzzled that you regard their normal and customary behavior as a fraud, and their "occasional moments" as their true selves. Wouldn't it make more sense to see their usual behavior as their true selves, and their occasional screw-ups as ... occasional screw ups? Just askin'---
"I used to believe that humanity was generally decent. Not anymore. I dont even include myself as one of the decent ones."
Well, you must have had some hard experiences. While acknowledging that "we're all sinners" --- that's a given -- I do not believe that we're all, as some say, "totally depraved."
I wish you well.