I feel conflicted about donating money to a man that I don't like.
Why do you dislike the man that you donated to?
He never thanked me for my donation. He didn't even reply to my emails.
It's understandable that you are upset that he never followed up after receiving the donation. You should make sure that he received the donation with a simple email.
He never thanked me for the donation so I am going to screw him over. He doesn't deserve to lead.
I don't think the situation warrants screwing anyone over, it could be a simple misunderstanding. Before you go getting yourself worked up, try to have a conversation with him to resolve your doubts.