I am astonished you think spraying people with pepper spray is the correct solution in that situation. Inconvenience is not a justification for violence. And that's what the protesters were doing. Causing inconvenience. If you can't cause inconvenience, civil disobedience isn't all that effective. Civil rights protesters were urinated on!! and had bleach poured on their faces !! by shop owners in the south. This is more of the same. That sort of violence against protesters was widely condemned then, why not now?