Why shouldn’t Jake and Dinos Chapman’s much publicised modifications – or defacements, depending on your point of view – to a £25,000 set of prints of Goya’s ‘The Disasters’ be considered vandalism? “There’s no reason why they should work on the real thing apart from vanity on their part. I find it objectionable that they should, as they have consistently done, compare themselves to Goya, because he was a deeply serious artist and The Disasters of War is one of the most powerful commentaries on war ever created.”