We appear to be between Scylla and Charybdis (which was always going to happen sometime). On the one hand I understand fully that Isil (and other extreme groups such as Al Quaeda) actively want us to intervene to give them moral cause for a jihad against the West. This course of action could also result in activating extreme reactions amongst the Muslim population in the UK. I would hope that the Muslim council - whose statements I have welcomed - would work actively to discourage this.
On the other hand, if we now do nothing, we are seen as a soft target. I may be shot down in flames here (one reason that I do not post a lot) but I suggest that the poem 'First they came for the Jews' may focus minds. Not doing anything will also encourage home-grown hotheads.
There was an earlier thread which mentioned about how someone would feel if they were the one in the 'boots on the ground'. Well, OH was an evacuee in the 2nd WW; saw bombs falling on Swansea dockyard; returned and hid in a cupboard with his mum during bombing raids on London; played in the ruins and found schrapnel to swap at school and stood stock-still in the street when the engine noise of a V2 ceased. Later, he did 2 years N.S., marching his platoon up and down in front of the wall of barbed wire which formed the iron curtain - he had a Lee-Enfield rifle and 6 rounds of ammunition (as did the rest of the platoon) - the guys in the watchtowers followed their progress with automatic Kalashnikovs!
I just gave that background to explain that he has always been in favour of 'jaw, jaw' - but now feels that we have absolutely no choice than to move to action. I agree, very sadly.