They are threatening the entire world - like NAZIs. They are killing Jews and Christians like never before. A disease like this needs to be stamped out or it will spread.
See:
http://www.foxnews.com/world/2015/02/17/isis-reportedly-burns-alive-45-people-in-western-iraqi-town/
This needs to be exterminated, all of ISIS and anyone who supports this thing.
They are not threatening the whole world. They are killing mostly other Muslims. Jews have figured out how to protect themselves ... perhaps Christians in the Middle East need to follow the example of Israel and get themselves into a defensive position.
Jew and Christians in the West need to get Islam out of the West or very tightly contain and monitor them. But we don’t need to go over to their lands. Just keep them out of ours.
Now if Iran gets a nuke, then we can say they are threatening the whole world.