A normal mindset for a soldier. Kill or be killed, we are all taught this. This is a war, however, where the enemy can come back to life like we can to fight again.

Being able to incapacitate an enemy is a skill that can be learned. Like you must have learned the places to hit to ensure death happens, there are places that ensure the enemy will not be able to act to do you harm. It can also be aided with tools such as rope to tie them up or drugs to cause hours of deep sleep.