The human being has evil in his being, some can have control and control of their actions but others can not control their actions. There are demons that take advantage of that and take control of that person leading them to do things that they never thought to do. That's why some people who have committed murder, then they say with sincerity, I do not know what happened to me ... or I do not know why I did it. There is a real spiritual world. Of course, there is also that person who enjoys doing evil.