Remember the Satanic Verses controversy? Remember “Je suis Charlie”? Remember the constant invocations of Voltaire and Orwell? The great irony of our age is that many of the cadre of politicians who spent years anointing themselves as champions of free speech have become its most enthusiastic enemies when the subject turns to one issue: Palestine.For decades, western governments lectured the world about liberal values. They declared freedom of expression the hallmark of a liberal democratic society. Protest was deemed patriotic while the right to offend was considered sacred. Then came Gaza. Suddenly, the principles that we were once told were...