They're being used deliberately to provoke the West, victims and killers alike. I'm sorry, but 3 dead westerners is not a reason to send an army in, no matter how brutal and sick their deaths. This is definitely someone else's war that some fools from this country have decided to get involved in. Those fools shouldn't ever be allowed back, but as rendering them stateless is illegal they should be instantly locked up forever. Or disposed of by special forces in situ.
Hussein at least had control of his country, even if we didn't like how he did it. We took him out - and at the time there were no jihadists in his country as he wouldn't tolerate it - and now we reap what we have sown. We should never go back - let the Arabs sort it out for once.