First off, let me just say this is a very elementary look at a very complex idea, and I would enjoy hearing what you have to say about this issue, about my comments about this issue, and perhaps even a critique of my logic.
Chacham really is to credit [to blame :P] with coming up with this question: Does evil exist? I have said that there must be a choice for evil to exist, but what about the things we don't choose? The first example that comes to mind is accidently running over someone -- in a choice-scenario you'd say that the person chose to run over the pedestrian, and as such is doing an evil act. However, when you don't choose that can't be evil. Or at least that's how our society views it. I mean, if you accidently shoot someone, they look at the intent of the person -- and since it was an accident, they deem it not evil and thus you are let off the hook. Now, whether they shold focus on intent is another issue I'll have to delve into some time, but overall our society equates evil with intentions.
Ok, so can we say that perhaps there is no evil in the world, only evil intentions? Because it is not the act that is evil (at least we have proven that there are cases in which an act is not evil even though it tends to be viewed as such) but the inferred intentions of the person that we see as evil.
So a recap, more for myself than anyone else: Evil is not equated to a choice, because you can choose between good things. But it requires a choice, and even in that choice it is the intentions of the person making that choice that can be evil or good.
So can we say that a person is evil? Perhaps, but maybe it'd be better to say that the person has evil tendencies. Can those tendencies be repressed, and thus the good comes out? I believe so, because I know many people who did evil things (as society has labeled them) and yet now are 40-something business executives who, as one put it, "had to get it out of his system." With that I think we need to introduce the nature/nurture debate in terms of evil.
Now, I started to look around, and I found this interesting bit discussing the overarching power of repentance in terms of evil. Various googling of "nature nurture evil" will get you similar articles. Now where am I headed? It's toward a recognition that there are evil intentions, and they are both a natural and nurtural (is that a word?). If you do not believe in a higher power, then you can quit this exercise, as you are only responsible to yourself and others around you. Now, if you are religious, you are responsible to a higher being, and that being has communicated through various texts what he/she/it feels is good and what is evil. So that responsibility looms over us, frightening in some cases.
In fact, as a Christian, as I read the bible I find Romans 6:23, "For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord." So I can go one step further and say that by grace God has forgiven me of my sins due to my acceptance and realization that Jesus Christ, his son, is indeed the only one who can rectify the evil I do. Because I know Christ, I am able to not worry about the consequences, however this does not mean that I should continue doing evil, as Romans 6:1&2 says, "What shall we say, then? Shall we go on sinning so that grace may increase? By no means! We died to sin; how can we live in it any longer?"
So, I've narrowed down the reading audience drastically, but these are my own thoughts, of which you are free to peruse, comment, and even scorn. I'm not a scholar, I have never done any philosophy, I just sit and think and type. Although before someone yells: RTFA!, I have, for me it's the Bible.