The decision by Queen's University Students' Union to ban the controversial Blurred Lines song may be hailed by some as a proper response to a distasteful, misogynistic pop record.
No-one can defend its lyrics which could be interpreted as promoting a rape culture.
But it is not the only song, book or magazine which could be viewed in that light.
Bans smack of totalitarianism. Once anyone sets off down that road it can be difficult to stop and the people who were once praised for acting with the best of intentions would then stand accused of limiting free speech. The lines, suddenly, become very blurred indeed.