David Cameron, we are told (News from Britain and Ireland, 24 January) says there is a right to cause offence; and Pope Francis says it is wrong to insult another person’s religion. Perhaps both are right. Speaking or acting to offend other people is certainly anti-Christian behaviour unless, as in the case of war, there is some proportionate good likely to be achieved by it. Catholics don’t, however, hold that all wrong behaviour should be forbidden by law. The Prime Minister, on the other hand, ought to know what rights are sanctioned by law. Rights are held against people, who have corresponding duties the law can enforce. The right to offend people is held against those who are offended, and the law can enforce a duty not to retaliate. Dr Johnson said: “Every man has