Complete strawman and a prejudice generalization of Islam and Muslims at that. Nobody is saying that you should do nothing about terrorism. People are saying you shouldn't generalize 1.6 billion adherents of a faith as terrorists and ban refugees on that basis. That helps groups like ISIL in their propaganda. 

Also, how would you like it if people used the genocidal actions of leaders like General Cortes and the Conquistadors, or the Crusaders as an excuse to generalize Catholicism?