And just think about it, Cameron wanted us to go into Syria but met too much opposition to his big idea!!
Hmm, in fairness (and I'm not saying we should have got involved in Syria, not by a long chalk) but the West's failure to intervene on the side of the "moderate" (these things are all relative) rebels in Syria is one of the things that tipped the balance to the extremists on the anti-government side. Without that, ISIS may have just stayed as one of many extreme terrorist factions in Iraq instead of being on the brink of establishing a pan-national mini-caliphate.
We have, as everyone else has rightly opined, made a right fucking mess of our involvement in both Iraq (and as a result) Afghanistan. What a terrible terrible waste of the lives of the civilians needlessly killed in both countries, and our own soldiers deployed on someone else's ego trip.