There is no gentle way to tell a people that their opinion or consent is neither needed nor sought. No easy eloquence, no soothing sentiment can issue from the tongue, so best to speak it plainly, concisely and calmly.
Protesters in the BLM are not interested in the respect, love, or opinions of people not prepared to ride or die for black people, all black people, not just the ones that make white people feel comfortable. The movement is about protecting the lives of the cleansed and corrupt, the virtuous and the vulgar, the saint and the sinner, The tactics used reflect this fact. They too are clean or corrupt, virtuous or vulgar, saintly or sinful.
If you are not on board with that, BLM is not the movement for you.