Start by checking mosques to see if they are arms and munitions storehouses and whether the imam has been recruiting ISIS soldiers or held terrorism training courses in them, none of which pertains to freedom of religion at all but conversely is a false church set up for the purpose of planning the takeover of a country and committing terrorist acts. If yes, bulldoze it and deport them.
The war in Lebanon in the seventies began about five years after the PLO was allowed to move into Lebanon. The PLO secretly began storing up and hiding weapons and then when the time was right all hell broke loose. Car bombs and every kind of violence turned the “Paris of the Orient” into a full on war zone.