ISIS will never be defeated completely, the religious power which fuels these people is too strong and unfortunately they will go to the extremes to evoke fear and terror upon western civilisation. The best we can hope for is that we are able to keep our security measures tight to decrease the threat of horrific incidents like yesterday, and hope that our military forces are able to weaken the Islamic state. Also we must sort out the Syrian crisis giving safety to those who need it whilst filtering out the evil terrorists.