In my opinion ISIS (or whatever they are calling themselves today) have one redeeming feature.
They are fundamentally stupid.
They are basically calling the US out.
They honestly seem to think 'leave us alone or else' terrorist threats actually work, when essentially, eventually, they are just going to get smashed.
I actually also think that they really do think that they can beat the 'West' in 'battle', Allah willing.
These guys are much more of a threat than Saddam ever was..if the people representing We, The People in government do their jobs (put it to a Referendum..), ISIS should feel the FULL wrath of the Western Arsenal, for the first time since WW2 if necessary.
Just give it to them, wipe them all off the map, rid the vermin, nice and quick before they start really getting dangerous.
It has to happen soon. You can't keep poking a tiger in the eye. The sooner the better imo, get it over and done with.