He killed three Chinese men because he thought that Chinese men were mistreating Chinese women, so he decided that he to teach them a "lesson". The racism is obvious in this guy. As for "mistreatment", we don't know whether what he see or heard was indeed legitimate sexist against women, or some misandry brainwashing bullshit. Whether the information was true or not, it just goes to show you that news about men mistreating women is enough to get men killed. Therefore all these men-bashing contents from those misandry subreddits have a good chance to serve as breeding ground for gender extremists to go out and kill innocent men!

Murder charges dropped in deaths of 3 in hammer attack – AsAmNews