Evil - morally wrong or bad; immoral; wicked

I do not understand how people can be so evil. My mom showed me an article that was in the paper today about Oakland and how in the past 5 years the homocides have been in the triple digits. These killings took the lives of people from the age of 1, to the age of 65. Last year there was a killing in riverside where a guy got in a fight with a friend/aquantance over a football game, and the killed, disembodied, burned, and then threw him in the lake. How could someone in their right mind do that? How can you think that you have the right to take someone else's life? I can see being very angry with that person, but how can you be so angry that you could take that persons life on a whim? You cannot be in your right mind... That persons life is not yours to take. God alone has given that person life and He alone should be the one to take it. But we, as humans, have decided we have the right to choose when a person dies simply because they made us angry, jealous, or upset. How can you justify that with no guilt? Do these people ever feel guilty about it? Or are they able to just "go on with life" as though nothing had ever happened? I know that most are caught and put in jail, but still. I do not understand how they could do that. Just take someones life on a whim! It makes me sad... Oh how I wish I could make it all better. I dislike all the violence and death.