You don't know they aren't, you just hope. History, recent and long term point to one occurrence over the other. Mostly peaceful as long those they rule do everything they want. The non Muslim inhabitants of Iran do what they are told or die. The recent purge in Iran where the government killed tens of thousands in the space of a few days is one of the most recent. There have been many thousands of Christians beheaded, shot, locked in churches and burned alive this century alone. Assuming it won't happen everywhere is a mistake.