Is this really surprising? Wouldn't you suspect they would use any means necessary to get what they want? ESPECIALLY considerering they are a religious group.
They are a terror group sponsored by foreign governments, not a religious group. Those guys never even went to Mekkah, but ready to kill people. Some of them are homosexuals and drug users.
so what is taking them so long to wipe ISIS out?
The terrorists have lost a lot of territory because of the bombings. It's taking long because foreign nations secretly support them. The area of Iraq, Iran, Syria has been a war zone for a very long time.
Foreign nations, you mean the US UK France Germany, they created funded and armed them, and the majority of other terrorist groups.