You got a point there because soome of them were very assimilated and considered themselves German since they were there for genereations. Some were converted and had married gentiles.
It's kinda what happened between the Tutsis and the Hutus. All of a sudden, neighbours, friends, and even wives and husbands turn agaisnt each other.
I smoke, I snort, I've killed and I've robbed, I'm a man - 10 yr-old Steak-n-Fries in City of God