Since the Opening Post hasn't been answered, I will provide it.
The reason "Black Lives Matter" getting the response "All Lives Matter" receives disapproval is because it is undermining the cause and credibility of the statement being made. It is natural that "All Lives Matter", and unless you are a bigot, it is what everyone in this thread shares. However, "Black Lives Matter" is a campaign due to the disproportional amount of deaths black identifying people have at the hands of police services. So whilst "All Lives Matter", it is the added point of "Black Lives Matter too"/"this includes Black lives".
Now, going back to why it is disapproved, say that Vuk is victimized in his postings. Every time he posts, Beskar gives him an infraction. Vuk getting upset with this treatment posts "Vuk Posts Matter" in the Watch tower. However, when he does, other members like Husar respond with "All Posts Matter". What is the effect of this? It de-legitimizes Vuk's grievance with his posts being constantly infracted. It is whitewashing the issue. By posting "All Posts Matter", you are not supporting Vuk or his grievance.
Now, I hope this has cleared it up for you.
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