presumably to prevent the continued migration of rapists and called for a database of refugees and won't rule out a database for all muslims. donald trump said to fight isis, we should quote take out family members of terrorists. pretty extreme measures that tap into many emotions but are they warranted? or just stoking irrational fears. joining me is a professor for political science at ohio state university and a fellow at the institute and author of chasing ghosts, the policing of terrorism. professor, i thought of you there was a front page story with this headline fear in the air americans look over their shoulders, should we not be looking over our shoulders? >> the fear is really important emotion if you're walking through a judge and will you approach a saber tooth tiger, fear is the appropriate emotion,