It is that time of year again. News arrives of 343 “university teachers” who signed a letter pledging that henceforth they will not cooperate with Israeli academic institutions. Their joint letter took up a full page advertisement today in Britain’s left-wing Guardian newspaper (where else?) and has caused almost no stir in Britain. It comes days after a letter in the Guardian’s letters page, signed by 150 leading British writers, musicians and others — including JK Rowling, Simon Schama and Hilary Mantel — opposed any and all such boycotts against Israel, and pointed out that in the eyes of most people, intellectual and cultural exchange is a good thing.