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It kind of is our business. Daesh bloomed and flourished in the chaos we and the US stirred up in Iraq. Even Blair admits this. It's our mess.
Air strikes as a response to the impotent need to 'do something' are unlikely to work, though. What's required is a political settlement in Syria, and cutting off Daesh's supplies and money. It will collapse under its own weight if that happens.
Well, my point is it's really not Britain's business at all. Let the UN deal with it. Just stay out of it, with the exception of taking in any refugees, who don't want to live there.
There are plenty of other countries who are doing absolutely nothing, and I don't see why Britain needs to be different.