At least US tried to make a difference. EU is very passive in that sense (I'm from EU).
the mainy problem in afghanistan is the fact that not many people feel a common sense of being an afghani. The country is extremely decentralised and rural. Most people only look at their villages and community, not at the bigger picture.
Chinese approach to radical islam will work. But West will never admit that.
Chinese see islam as totalitarian ideology that is incompatible with Chinese values and competing communist totalitarianism.
Only thing is that when they left, we made sure the Nazi's didn't come back.
Right now they were training Afghans to have their own military, but it's all so corrupt that it is just an impossible task. Those who can will flee the country instead of fighting for it.
Initially, Taliban offered surrender. US denied their terms. So they kept on fighting and rebuilding.
They took over the country in less than a month. They never left. They were always there.