The problem isn't at "the core of the human being", although religion has worked at keeping this drive to evil at bay for centuries.

What is it then?

Demons. Yes, evil spirits that influence, control and infuse thought into each and every one of us. I am being serious. In another language, I have written quite a bit on the topic, including how religion used to warn people about "thoughts from Satan" or in say, Buddhism, "the 3 (or 5 depending on the version) poisons of the soul" which all point to the same thing: thoughts can be unbelievably shitty, even among beings of awesome quality. And if you let them, they will influence you to the point of defining your very life.

https://saidit.net/s/Psychology/comments/58du/demons_are_real_psychiatric_experience_of_demons/

The world is splitting into two different types of people: the degenerates that obey demonic influence, that is, act as their thoughts dictate, and those who don't and maintain wholesome behavior no matter what influences the culture, environment, media, etc. are trying to exert on their behavior.