It wasn’t self defense. The agent had no business approaching the vehicle or attempting to detain her. She was fleeing a kidnapping attempt if you want to get pedantic. He murdered her because he didn’t like her politics. He wasn’t acting within the scope of his duties and she wasn’t doing anything where he had the authority to impede her. You don’t know jack shit about the law and you are just trying to cope as you realize you are an authoritarian. Good luck with that.