Thought provoking.
Clausewitz defines war as an act of violence intended to compel our opponent to fulfill our will.
Either those of opposing will must remain as opposing nations checked by our national defense or they must be overcome and subjected to our will.
International peace will not come by acquiescing to the doctrines of murder and evil advocated by Islam.
The goal of war is to get your enemy to stop fighting. Insider attacks stop training of troops loyal to the mayor of Kabul, Karzai and get us to quit fighting sooner.
We are training the future Taliban and some of them want to kill Americans before we all leave. Their fathers and grandfathers that killed Russians are still heroes in their villages.
What is interesting is that the shooters usually drop their weapons afterward and quickly give up. They know they will be treated better in prison than in the Afghan army and they all know this:
They will be released as soon as the Americans are gone.
Think about it. What is their downside?