BERKELEY, Calif. — What do you do as a reporter when a protest begins? You cover it. But what about when the man being protested is known for rhetoric that makes you nauseated? Or when you see a student get beaten up because he looked “like a Nazi”? How do you remain objective? Those were the questions that faced me when, as a reporter for the student newspaper at the University of California, Berkeley, I covered the protest on Wednesday night at the college that turned violent, drawing national attention. I didn’t know what to think about it all, and...