I also largely attribute this (your observations) to christian influence. The bible teaches that the first social institution created by god was the family, and definitely promotes a "He who is not for us, is against us" mentality. Are a christian's acts of "goodwill" ever completely genuine? Or are they performed out of obligation, fear, or the desire for personal recognition (because of the lack of personal validity inherent in the faith)? I see christianity as a narcissistic entity, with the inevitable result that very little AUTHENTIC good can come from it (in other words, the "good" that comes is a result/side-effect of a christian's motivation for self-preservation... whether it's an obligation to obedience, or the fear of eternal damnation). It's the same way a child reacts to the overuse of punishments and rewards...they soon become so obsessed with gaining the reward and avoiding the punishment, that they lose all intrinsic motivation to do good. While it's shameful behavior, it's important to recognize this as a direct result of one's conditioning, and not a reflection of their true, unadulterated nature. To me, the greatest irony of all is that the very people who are exalting themselves because of their self-proclaimed holiness are the ones administering the poison that is destroying our culture. It's a "big picture" kinda thing.
"The roots of the Tree of Good and Evil are all intertwined." Morality is subjective, often, dpended on where you are and who you are with. Have you read any of the behavioral economics books like Freakonomincs, Super Freakonomics, or Predictably Irrational ? I read an old textbool on criminology tha has me believing that most of us are more "bad" that we're willing to admit and that many people would be shocked if they knew how "bad" most of us are.