Please do not put Black Lives Matter in the same category as Antifa.  Very rarely has BLM engaged in or preached violence.  It is part of "implicit bias" that people see violence tendencies in black people where there is none.  Antifa, unfortunately, has good intentions but actively preaches violence.   It is generally not fatal violence, not homicidal, but rather a violence of fists and clubs (which of course themselves can accidentally result in violence.)  I support the goals of both groups but condone violence only in a case of necessary self-defense.