Nicholas Kristof is starting to grasp the totalitarian nature of progressivism. Progressives are goal-driven, not process-oriented. They want power over others so as to impose progressive views and values (egalitarianism, cosmopolitanism, atheism, pacifism) on society. Nothing matters to them except this end. Progressives will lie, cheat, steal, and even kill (if they think they can get away with it) to achieve their goals. Stifling speech on college campuses is a piece of cake to them. They don't even think it needs to be justified. Conservatives, in their view, are not to be reasoned with or even conversed with, for that takes time and energy. Conservatives are to be crushed, like cockroaches.
Progressives don't care about truth, the rule of law, individual rights (including the right to speak), civility, rational discourse, or the only inclusiveness that matters: intellectual inclusiveness. The end (viz., power) justifies the means. Progressivism is a cancerous outgrowth of liberalism, dating to the 1960s. It is heartening to see that at least one New York Times op-ed columnist (Kristof) understands the danger progressivism poses to society. Having blasphemed against the Church of Progressivism, he must prepare to be excommunicated, and then vilified. If you're not a useful idiot, the Left wants nothing to do with you. Indeed, it wants no you.