It depends on what the goal of the protest is and an assessment of whether the act is going to actually be successful in bringing about the change they want.
If that isn't taken into account it'll just make people more ingrained in their beliefs, and possibly increase hatred towards the groups and the cause overall. Which can just lead to increased conflict and increase extremists on both spectrums.
Sometimes then the cause just devolves into people on both sides just reveling in getting to act out their primal desires.