Classic Lose-lose dilemma for the controlling authority.
Restrict your forces to non-lethal responses and passive "shepherd" tactics and every once in a while the crowd will feel its oats, ignore the discomfort of tear gas and cry havoc. You then look like idiots while they destroy portions of the town.
Allow your forcs to use lethal force and you end the riots but have massacred your own citizens. Almost invariably those massacred will be "members of the crowd" and none of the real fomenters will get whacked -- but they'll lead the outcry against your barbarism.
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