The problem is that -- well, firstly, something is being done and in Iraq in particular ISIS is being pushed back. More needs to be done and there is a lot of bloody fighting ahead. But the problem is that politicians of the West lost support for sustained military action in the Middle East after the mess they made of Iraq and Afghanistan the most recent time we went in. Badly planned, particularly in the aftermath, rather unpopular because of the lost soldiers, and now of course with little to show for it as the region is still unstable, if not more so.
And this really is the problem. There is an urgent need to defeat ISIS as fast and as completely as possible. People may inevitably ask "what next?", though. I don't think the problem will go away just by winning another war. We will then need to commit to a long-term programme of rebuilding the region, stabilising it, setting it up to maintain its own security. Everything, in other words, that should have been done after the earlier invasions in the first place but wasn't.
Despite all the horror and nastiness and bloodshed, and utterly depraved and barbaric acts committed by ISIS members, there just seems to be no will any more to do what is necessary -- either from politicians or, more importantly, from the general public, whose opinions in this case are leading the politicians to hold back.
It's wrong, it's horrible, we have to intervene at a greater level than is currently the case. But also we have to be prepared to stay there and, this time, do the job properly. I suspect that many people would rather hit and run, which is only a temporary fix. More will follow in ISIS's footsteps, regardless of how many of them are killed, without a rebuilding effort.