What is "evil" and how does science knows "it" is an illness? Is Mr. Brevick a "sick" person, or an evil one?

If we all are 'sick' to some extent, who is then "guilty"? Educated answers please. No 'tire kickers'...|||Depending on what religion you believe in, evil and sickness are deeply intertwined. I will give several examples:





Christianity: Probably the first one that comes to mind. They believe insanity is synonymous with demon possession, and believe that any of those 'illnesses' can be 'cast out'





Scientific theory: Imbalanced chemicals in the brain cause people to develop hereditary mental illnesses.





However a lot of people believe both: If someone is born 'evil', it might be because it is a demon passed onto them from their parents, who had an imbalance of hormones in them, and so now their children do. So 'we will get them medicine and therapy and take them to church to get the demons cast out'.





You figure out what you want to believe. I don't know who Mr. Brevik is, nor do I really care.