Troops from Canada, the U.S. and other NATO countries are there to protect the local population.
Yet, they do not, and cannot, trust the very people they are ostensibly there to help. Every pot-maker in a motorized rickshaw every teenager with an axe is a potential enemy.
As a result, incidents like the shooting of Nasrat Ali are fated to happen. Canadian soldiers will understandably fire on civilians that they think might threaten them.
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