As the war between Israel and Hamas rages, students across the Bay Area have become tangled in its ideological crossfire. And as the death toll in the Middle East mounts, the vitriol across American campuses has too, with threats, discrimination and online harassment popping up at universities from coast to coast. It has grown so contentious that two University of California, Berkeley, professors from opposites sides of the conflict felt compelled to plead with students on a campus that was the birthplace of the Free Speech Movement to stop the harassment. “We are two professors on this campus who disagree,...