According to George Soros, the billionaire financier, the refugee crisis is causing it. Germany and the other countries will have to find a way to find jobs for refugees and teach them the languages of their new home to assimilate their new culture. If not, they can be radicalized.
http://finance.yahoo.com/news/europe-verge-collapse-soros-161420378.html# http://finance.yahoo.com/news/europe-verge-collapse-soros-161420378.html#
