If someones behaviour warrants tracing of IP's, it can be done without them being displayed.
Those that participate in good faith have nothing additional to worry about. IMHO
Censorship and the ruffled feathers syndrome defeats the purpose of an open board. With the exception of personal attacks and gross repeated vulgarity, members should be freely allowed to express their view even if it is unpopular.
This, the question becomes, why display it?
He should have taken your counsel to apologize to the member he so unfairly and grossly insulted.