Really? Groucho, Harpo or Chico?
I've always had an affection for Harpo myself.
mikezpen is right that people who espouse Black Lives Matter are a danger - to his politics.
The more that people buy into the slogan the greater chance that they will act in a real political way.
Persons who commit violence or property damage are a threat to the movement - and also a tiny minority.
They give Trump et al the excuse to attack action coming out of anger based on the destructive actions of a very few.
Conspiracy theories beside ("BLM, is a hardcore extremist outfit,") they are at most a loose association of activists but generally not even that.
A typical affiliate is pictured below.
Almost makes me wish I was religious.