My (Ben's) propositions:
(A) Black Lives Matter is a militant neo-Marxist organization whose real agenda is to replace constitutional democracy & our market-based, mixed economy with intersectional socialism.
(B) The central narrative of the Black Lives Matter organization is based on sweeping generalizations about and indictments of systems and groups of people that are in direct contradiction to the findings of the most rigorous quantitative studies.
(C) Directly relevant, verifiable facts about propositions (A & B) are directly relevant verifiable facts about propositions (A & B) regardless of who brings them to one's attention.
(D) People who disagree about competing claims should be able to agree on consistent standards of evidence by which to evaluate them.
(E) If proposition (D) is impossible, then constructive engagement across different perceptions of BLM is probably also impossible and not worth our time and energy.