You're being downvoted because you're objectively wrong, factually and morally. The kid went out with the intention to kill someone, brought the tools to do it, and did it. It was absolutely premeditated. He killed people trying to disarm him. He did not act in self defense, he murdered 2 people in cold blood.
He was allowed to get away with it because the republican party and their allies want to encourage more vigilantes to be killing leftists and minorities.