Like their friends the Nazi's. As Martin Niemoller put it, "First they came for the Communists, but I didn't run because I was not a Communist..." In 1948, first they came for the Jews (in Egypt, all of North Africa, Iraq, Yemen and Syria, just 3 years after Europe's Holocaust, virtually all that could fled to the new State of Israel.) So today a handful of Jews survive in each of those places where their ancestors had lived for often a millennium or more.
Now the Islamists come for Egypt's Coptic Christians like they have in Somalia, the Sudan, Ethiopia, Eritrea, Albania and Kosovo. Many of Egypt's Christian communities likely pre-date Islam itself. Where is the outrage among the leading Christian organizations?