As I've said in other threads, I am not s supporter of having govt super citizens with rights and powers above the common peasant. Not only do I believe it is impossible to legitimately create such super citizens because it's impossible to bestow upon another that which you don't possess, trying to do so is a recipe for tyranny.I still look at it this away. Would a LEO be charged for murder in that case? IMHO, No and they would have had the Law of the Land if thier side and the most instinctive law if all in their side. Self preservation.
If they should have charged with anything maybe if illegally detaining him.
Go back to the principles of the founding fathers, they would have eschewed govt police and said the citizenry needs to be responsible for upholding the law and keeping society civil.