Lets suppose, they say, that one of you passes over to the enemys side and relays state secrets to the enemy. Do you not kill him? Does he not deserve a radical punishment? The apostate betrays the community!
Which reinforces the fact, a fact Muslims try to deny, that they view all non-Muslims as an "enemy".
Vy clever design...but it is under attack by modernity and must either destroy the modern world or die (I guess it could change but there has been no substantive evidence of that yet).