When the Japanese bombed Pearl Harbor, the United States removed people of Japanese ancestry – many of them U.S. citizens – from the West Coast to inland concentration camps. This was not just, but it was justified because of the destruction of the American Pacific fleet and the spectacular early Japanese military victories.
Thus we are given precedence for dealing with the Islamic Jihadists – many of them citizens of various European nations – who are waging, or who threaten to wage, war against their homelands. While concentration camps are not feasible, what might work is to prohibit re-entry to Muslim youths who leave their countries. This is not just, of course, but it is justified.
Eugene L. Conrotto, Modesto