“KIDNAPPED,” the posters say, in bright red block letters above pictures of people taken hostage by Hamas terrorists during the Oct. 7 attack in Israel, urgent reminders of the men, women and children still being held hostage in the Gaza Strip. But on college campuses and in cities around the world in recent weeks, people have been caught tearing them down. “You should be ashamed of yourselves,” a man says in a video posted on social media as he watches two young people at the University of Sout