You may offer your opinion, once, twice. Then drop it. You will be happier if you choose not to engage in that argument. It is a choice, and you have the power to make it.
Most arguments are purely subjective, where there are no rights and wrongs.
It comes down to an opinion or feeling. Other times, however, there is no mistaking what the truth is. I've read your information about angry-guys and abusive people, and their case studies. I am an angry person when I feel that someone I care about is trying to deceive me. All my trust for them goes out the window if I think that somebody feels that the truth isn't important, certainly not important enough to ruffle anybody's feathers.