He repeatedly violated the Terms of Service that he agreed to in order to use this forum.
I think he should have been banned quite some time ago. I am against censorship of ideas or discussion or criticism. But quite often his posts were none of those. They were verbal violence against another Forum participant.
"You agree, through your use of this forum, that you will not post any material which is false, defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, adult material, or otherwise in violation of any International or United States Federal law. You also agree not to post any copyrighted material unless you own the copyright or you have written consent from the owner of the copyrighted material. Spam, flooding, advertisements, chain letters, pyramid schemes, and solicitations are also forbidden on this forum."