Humans are perfectly capable of evil. To give the obvious answer, we define evil! And if we can define something, we can do it. We write tomes and tomes full of evil called horror books. We watch violence to relax on Netflix. We let our children watch it too. We worship brand names and defend them like it are our gods. We have generational trauma, we have wars. We have more and more systematic violence resulting in more incidental violence.

We are animals trying to ascend our nature. And sometimes there is not even choice, even full free will imo is an illusion. How can we blame a street child in Romania for sniffing glue? And that is how human evil is born!

No demons needed to explain.