I Protest!
Mikey, Mikey, Mikey. What the hell? Whoever told you this was a good idea? Offering discounts to protestors to incent good behavior? First of all, I'm not so sure that the protestors give a damn about getting discounts and free magic markers from Kroll Office Products. I know that when I'm going out to do some protesting, office supplies are the first thing on my mind! "Hmm," I wonder to myself, "Where can I get some cheap index cards and ballpoint pens?"
Not to mention that the compliance is purely voluntary. There's absolutely no enforcement mechanism. Anyone can get the discount regardless of whether or not they obey the laws. So if you want to break a few windows and still get cheap index cards, not to mention meal discounts at Spoonbread (?), no one will stop you!
Yeah, this'll work. Fortunately, I don't actually think things are going to get out of hand anyway.