BLM is a Marxist organization. (Don't ask me; ask the founders, who are rightly unashamed to say what they believe.) Marxists believe that there exists somewhere in the future a world in which power does not corrupt. That's ignorance on stilts. They are wrong, and they are dangerous, and they should be opposed by anyone who values our bourgeois freedoms enumerated in the Bill of Rights.
Racism is a scourge, and Black lives do matter. But the organization is a threat to freedom, and it should be shunned, not worshiped.