I never thought that it was volatile while I was there.

The British involvement in and with Afghanistan lasted from 1839 to 1919 and out of that eighty year period the British were only in Afghanistan for about seven years. At no time throughout that period was it ever considered desirable to incorporate Afghanistan into the British Empire of the day as that would completely defeat their objective which was to maintain an independent and neutral buffer state between India and Tsarist Russia. In achieving this for as long as they wanted it the British were 100% successful.

As far as the "foreign built" infrastructure goes much of this has been asked for and built by Afghans themselves but paid for by foreign aid. Irrigation and hydro-electric schemes destroyed by the Soviets and by the Taleban have been repaired and new ones constructed, those enable the farmers to grow more. The improved roads and bridges mean that farmers can now reach more than one market a week so I do not think that they would allow those things to be destroyed easily.

But we will see, I wish them well - Doesn't matter how dire the situation or the outlook at some point in order to survive common-sense has to kick in.