IHE has the story.  If "conservative students" feel "besieged" because they believe, inter alia, that human activities don't contribute to global warming, God created the world 10,000 years ago, Darwin's theory of evolution by natural selection is "only a theory," or that Rep. Paul Ryan's budget plan was a serious attempt to balance the budget–all things that that benighted cohort of American "conservatives" often profess to believe these days–then they should feel besieged because they live in darkness, and it is the job of universities to bring enlightenment.  Truth and knowledge is not evenly distributed across the political spectrum, and the modern Republican Party in the U.S. has claim to precious little of either these days.  If students are "besieged" because they do not have a fair opportunity to defend their views with arguments and evidence, then they have a legitimate complaint.  End of story.