We respect the writers of yesterday’s letter (18 August) and share their view on the illegality of the Iraq war and Tony Blair‘s nefarious role in engineering this country’s participation in it. But we can not share their call for Waterstone’s to desist from promoting it on the grounds that the event “will be deeply offensive to most people in Britain”, even if that were the case.

When it comes to literature, drama, journalism, artistic expression and scientific publication we must be consistent in our support for free speech. How can we defend the right of the Birmingham Repertory to put on and advertise a play like Behzti, despite it being deemed offensive to some Sikhs, and then call on a bookseller not to promote one of its books – or a library not to stock it – on the grounds of offence? The answer, in a liberal society, is to not read the book if it offends you, and to not buy a copy if you don’t wish royalties to go to the author.

While Iain Banks and colleagues say “Waterstone’s will seriously harm its own reputation as a respectable bookseller by helping him [Blair] promote his book”, we think its reputation would now be harmed by caving in to this sort of pressure.

Dr Evan Harris Trustee, Article 19

Jo Glanville Editor, Index on Censorship

Jonathan Heawood Director, English PEN