> Whether you see it or not, the vast majority of people /are/ generally good
I've always found this sentiment to exist exclusively in privileged and overly educated, left wing, Western circles. It is an extension of the philosophy built around tabula rasa, and posits that individuals are not to blame for their actions, but rather society. When someone harms another, it wasn't because they wanted to harm another, but because society failed to instill the correct values.
Even a cursory inspection of history would disabuse one of this notion, but the myth persists. I suspect it's because it clashes with another fundamental privileged and overly educated, left wing, Western belief: that inequality is always caused by injustice. That it cannot be a normal and expected outcome of people making different decisions. This fanciful ideal suggests that we should all be equally successful, with the same possessions and jobs and homes and values.
Back here in the real world, with zero exceptions, we know that power inevitably corrupts even the most chaste and moral of people. Humans are both a product of their environment and possess free will. Both. At the same time. Many people choose to use their free will to harm others, and in places where the rule of law fails, this proportion explodes. This suggests that some very large proportion of society chooses to not hurt others not because of some innate morality, but because of the consequences.
Of course I understand all of this conflicts so deeply with your beliefs that you will choose to dismiss them out of hand. Feel free to consider my comment nothing more than some superficial thoughts.