How do you suggest we help these sex slaves, carpet bomb their village? The west could wipe out ISIS in a week, faster if we used tactical nukes, the reason we don't do that is that we value the lives ISIS are so eager to sacrifice. Containing these arseholes to one patch of desert is the best we can do right now, they have bitten off way more than they can chew. We tried a ground army and it made things worse, we don't need to spill our own blood purging Saddam's generals from the desert, time is rapidly turning their own tribe against them.
In a historical sense ISIS may have actually done something useful, they concentrated the command and control of islamic extremists into one place and have united the Sunni's, Shiites, and Kurds in a fight against a common enemy. They are penned in on all sides by nations that are hostile towards them, they have no hope of expanding beyond Syria/Iraq (and possibly Afghanistan) via military means. What happens after ISIS is gone I don't know, but the idea of a caliphate where they are not in charge is scaring the shit out of all of the tribal leaders right now and may just force the three tribes to find a more civilised way of disagreeing.
This war is a muslim war, if we charge in now boots and all it will revert to a muslim vs the west war which is precisely what ISIS wants, they want us to try and root them out because they believe that would line up the tribes behind them (better the devil you know and all that). The best thing the west can do now is work with Russia to avoid falling into the old cold war pattern of fighting proxy wars using impoverished nations as their pawns. If the west and Russia start openly fighting for influence in the region, we are in a different and much more deadly ball park.