Note: I am aiming to debate a general issue of what people think should be allowed/not allowed on an internet forum, with no reference to any specific forum, nor with specific examples.
I think censorship is necessary on an open internet forum. Nobody would sanction the use of racist terms (to take what would usually be deemed the "ultimate" taboo), so there are notional lines that we recognise should never be crossed. Should we expect every forum user to have the same notional lines? When can we demand that "our" line demarking offensive/not offensive is the right one? Does an open forum simply have to cater for the wishes (and notional lines) of the majority?