I, as a cis gendered, white, straight male can walk up to a BLM protest without fear of harm and would be accepted as an ally. People of color can't even go into stores, or predominately white neighborhoods without being regarded with suspicion. 

BLM is not the scary boogie man that the right wing media attempts to portray them. But then people thought the civil rights protesters during the 50's and 60's were scary too.