Who'd have thought removing the dictators jackboot from the throats of so many tribal and sectarian zealots would have had such a disastrous impact, eh?
I cannot believe western governments didn't see this coming - I dare say their diplomats understood the situation quite clearly, but a politician never let such knowledge get in the way of a selfish, shortsighted intervention in an area they made no attempt to understand before rallying the troops for the folks back home.
That said, I'm in two minds about how to deal with this.
The first is to just wash our hands of the whole region and let the arabs, the israelis, the militant shia/sunni and all of the rest irrigate the desert sand with each others blood for as long as it suits them, so long as it is contained within their regional borders.
The second is to continue as we are (not that we have much of a choice now) and do what we can to obliterate as much dangerous extremism in the middle east as we can, by conventional or non-conventional means.
As for the US acting now 'cause of oil innit' ...I'd say control of the regional oil production ending up in the hands of isis would destabilise the region to such an extent, providing isis with even more revenue to expand their particular brand of insanity further - given the means they're hardly going to call it a day now, are they?
This must not be allowed, for many reasons, oil production being only part of a chain that links the future prosperity and economic and social stability of the region, seeing as oil is about all most of the arab countries have worth exporting. After all, about the only other thing the ME has to export abroad is militant, extremist islamic dark age brutality, and we all know how well that's received - like a rotting corpse in the village well, it's bad news for everyone.