Whether they will obey orders or not is one thing but personal feelings on the issue is another.
It is not a matter of personal feelings, it is a matter of what constitutes a lawful order.
My point was that generally speaking, it is universal to all nations that cops feelings don’t amount to much, they not only obey orders, they mostly obey whoever is in charge, I just don’t think that the Soviets or the Germans would have had to do much to change the police in America, the police would mostly just read the new orders and carry on.
There has to be some small/tiny percentage of police who would refuse, resign, or something, but I don’t recall hearing that it is ever a problem for occupation forces and conquerors, or corrupt governments to keep the police dealing with the citizens in whatever manner is required by the bosses.