To leave Afghanistan as a playground for terrorists and adventurers was simply not possible anymore.
Of course the UN brings in a lot of moral authority.
However, it does seem now that the international community, more importantly the powers that have influence, and, even more importantly, Afghanistan's neighbors realize that it is high time that they work together, and not against one another.
In the globalized world that is ours, maybe we are moving towards a global village, but that global village brings in a lot of different people, a lot of different ideas, lots of different backgrounds, lots of different aspirations.
There again, that is a fundamental principle: no two situations are alike.
Several million people inside and outside Afghanistan are destitute and desperately in need of help.