“You’ve created an environment so whenever any incident of injustice or perceived injustice takes place, it’s going to be amplified,” said Daniel Gillion, a political science professor at the University of Pennsylvania, who studies protest movements.

Black Lives Matter Grows as Movement While Facing New Challenges – The New York Times

Sorry for the inconvenience folks, being polite and respectful did not reduce the number of police shootings of unarmed African Americans, so protests will continue.