I wouldn't call this a 'peacekeeping operation.' And surely it is primarily the warring factions rather than us who are 'condemning' people to homelessness, death, torture and rape.

I agree of course that the so-called 'Islamic State' appears to be acting in a cruel and barbarous way. Also that the war (like all wars) is causing appalling suffering. But I'm not convinced that we in the West will make things better by joining in, at any rate without formal UN approval. I fear we shall make them worse.