Let's do a though experiment. Think back to a time when you were faced with a bad decision and, for whatever reason, you made the wrong choice. It doesn't have to be horrible, evil or anything life altering. The point is only a wrong choice; one that caused you regret, guilt, perhaps shame. If you are being really honest, this could be something you've never shared with anyone else. Perhaps you have something you've shoved into the dark corners of your mind to prevent the pain it caused you.
Do you have one? If not, think on it. We all have something at some level.
This decision from your past is yours, and yours alone. Don't share it with me (it's honestly none of my business). Don't share it with anyone you don't want to. This is a thought experiment to see how honest we can be with ourselves.
We need to confront the evil nature of ourselves. This is going somewhere and I hope you'll join me in this.