Closing borders isn&#x27;t going to help if you have thousands of people who have no future and who are looking for revenge out of frustration. This is not to blame anyone, but it&#x27;s more a matter of fact. Paris has seen many riots in the past years, where hundreds of cars have been destroyed by these people. It&#x27;s not surprise that you can find some people in that group that are vulnerable or attracted to the tactics of IS.