Of course we could but what then? Back in the bad old days Great Britain have crushed Isis and put in place a pro-western puppet and improved the lives of all the people to the best of their ability. But those were the bad old days.
You crush ISIS for the sake of humanity, and to set an example to anyone that is contemplating copying them to take their place. Like we did with the Nazis. As far as what do you do after that? That's very complicated - and everytime we try OUR solutions in the Middle East - we muck it up even worse. Maybe we should just exterminate the ISIS infestation and then let them figure it out for themselves.
Frankly, I'm sick to death of them.
ISIS is a scourge on the whole earth and will spread if we don't stop them - that's the reason they should be wiped out. The politics? That's a real fustercluck, we need to get the hell out of that.