New Orleans/Katrina is evidence of that. Didn't both the local police and the National Guardsmen deployed participate in disarming law abiding citizens? They always forget that their oath is to the Constitution, not to unConstitutional orders.
They did indeed. You don't have people going into police work because they think that there are unconstitutional or stupid laws that shouldn't be enforced. And you can bet that these modern day einsatzkommando wannabes feel fully justified with themselves because they were "just following orders"