ISIS are worse than the Nazi's. As evil as the Nazi's were, they tried to cover-up their brutality but this lot seem to gloat in it. The world cannot stand back and let this group commit unspeakable crimes and grow in numbers. How they can do this in the name of Islam i don't know, they are savages, nothing more.
Hmm... no. They are not. The Nazis butchered some 25 -30 million innocent civilians, just because they thought that these ethnic groups were inferior. (6 million Jews, 4 million Poles, 1 million Roma, 10-15 million Russians / Ukrainians / Belarussians, and many more). How many people have been killed by the ISIS so far? The maximum number might be in 5 figures?
That said, the ISIS is pure evil. They are a bunch of barbarians.