Therefore we cannot rely on the promises that there would be no persecution of afghan politicians- including those who cooperated with the West?
Certainly not. I am certain that they will turn against these politicians at some moment. The Taliban will definitely impose sharia laws; therefore my predictions are the most pessimistic.
What would that mean for local politicians?
If we recall what happened the previous time the Taliban seized power, a large number of people met violent death. It may be difficult to predict how it will turn out this time. On the other hand the Taliban wishes to retain the international economic aid to Afghanistan which has been significant. But many governments have said that they will cease their aid immediately if the Taliban should violate human rights and act in an uncivilized manner.
The USA and its allies have invested billions of dollars over two decades in developing, training and arming the Afghan army, special forces and air force. But the Afghan security forces were no match for the Taliban. How did their mentality degrade to the point where there was no opposition?
I believe that one very important element was that the structure of the Afghan army, which we had built up, could not withstand the Taliban attack. It was not a matter of force since the Afghan official armed forces were far larger than the Taliban units, their armament was much better, but they lacked the willingness to fight.