I agree with the last statement, just not the initial two you made. I am very concerned that institutional policy within the police department and the SS led to this incident, not just a rogue officer who overstepped his bounds. There is plenty of blame to go around, but if the institutions are corrupt, then it matters not about what an individual may do carrying out its policies. Therein lies the danger you are talking about, i.e., the “Nazification of the USA” starts.
Going after institutionalized corruption has to have a start, and that start is going after the obvious, which is the offending officer. The victim can go after the SS too, but he better know what the officer and his superior had to say to them. I haven’t worked with the SS, but I have worked with a lot of cops over the years, and I know they are sensitive about having citizens go after them in the courts. Most police officers have a very limited understanding of the law, and they prefer to stay away from the receiving end of it. But, I agree with your reasoning.