That's the problem though ,aog. You think random may mean "within the group so targeted" But that's saying that all of a group can be picked at random.All black,all white,all young people,can be targeted simply because they belong to that group. Now, how is that targeting? It's an abuse of the word,but one which you are happy to employ, to mean stopping individuals and searching them on the grounds that one, or lots,of the group who share that colour,age or anything else so broad, have committed a crime or crimes.
I ask whether ,if white on white murders occurred in your area,would you be happy if white people were being stopped simply because they were white and the suspects were white? What if the suspect was of your age? Are the police to stop anyone in the area simply because they are white and of your age? That's what the complaint is about.