[W]hat is happening is what left-wing revolutions do tend to produce, whether they're talking about the Russian Revolution or the French Revolution, and that is students – the next generation of revolutionaries – become not only more radical than their radical professors, but they turn on them so the revolution tends to consume its own. So now people who think of themselves of impeccably left-wing will say something that offends some group of radicalized students – perhaps students that they themselves helped to radicalize – and suddenly they are the ones under fire for not conforming sufficiently to the contemporary orthodoxy.