Yes I understand your point of view David, but there is every chance that the Taliban will join forces and support the Caliphate
All are Islamic fundamentalists, and Islamic fundamentalism is one of the gravest dangers to society.

This is a wonderful chance to pull the great powers together in a real attempt to defeat terrorism and get away once and for all from the Cold War mentality promoted by the Bush, Clinton, and Obama administrations.

The key will be world trade, both Russia and China are anxious to improve trade and if we can become strong trading partners trust and unity of purpose can ensue.

Circumstances alter cases and to walk away from the middle East at this juncture is just not a viable option....neither is the option of going it alone likely to work, as East and West will fall back on the default position of trying to gain as much personal advantage as possible.
We are entering an extremely dangerous period regarding to protection of economy and society against Islamic terrorism.
The first biological or chemical attack by these lunatics will send the developed nations into meltdown.