Back in September of last year, Thomas Klocek did what you'd think is perfectly OK for a professor to do — mandatory, even, for one who is intellectually honest and believes it his mission to challenge students to think clearly and know what they are talking about. It may have wrecked his life, however, when he stopped at a table at a student-activities fair to debate for maybe 20 minutes with students maintaining that Israel was murderous in its treatment of Palestinians. He argued back. Israel, he said, tries to avoid civilian casualties in warring against terrorists, but Palestinian suicide-bombers...