What is HR body within a legal system? It is not an arbitrator for delivering the "ballanced image" of injustice for there are state institutions responsible for this. HR is by definition a non-governmental organization just as the organs of free press are which provide merely their political view of "general image". But both can (but not always do) sue anyone (including the state) on the basis of the laws of the country or the international ones. At the same time they are accountable for the accuracy of the factual information they find and provide (so far Israel state attorney didn`t accuse HROs in that). You can sue state as well and HRO simply represents an entity of people with common case.
Judge sets $1m bond for Ohio officer charged in murder of unarmed African-American (Reuters)
from the article: Patriotism sans borders