Because it shows a clear pattern. I find it remarkable that he doesn't see a problem with being intimidating. When is it ever ethical to be intimidating?

Not to mention it's hypocritical to be so adamant about someone else's behavior when your own history is so spotty. It shows me that the guy tries to push his own view to the exclusion of all others - if he doesn't agree with you, or he gets mad, he tries to destroy you.