While regrettable, his hellban is entirely necessary. Almost every comment he makes refers to "f------- n------" (censorship mine). To quote one from his page of most recent comments: "I spend my days clubbing r----d-n------. CLUB! CLUB! DIE N-----! CLUB! R----D! N------! DIE!! CLUB! N-----!"
That's not really something we can have on HN.
(edit: right, asterisks are formatting here)