I would consider myself to be the epitome of evil.
What makes you think you are an evil person?
I was in my car then thought about stabbing a homeless person.
If you are fantasizing about harming people you should seek mental help. It is not normal to want to hurt other people.
I only want to stab him in the butt with a needle to ruin his world.
The instinct to harm another person is dangerous. You should consider finding someone to talk to before you put your thoughts into action.