Yes, if you let one greedy little Girl Scout start selling deadly "snack" cookies on the street, you'll open the flood gates to all kind of illegal activity. Why pretty soon, you'd have illegal immigrants selling fake watches, CD's and tapes, hot chesnuts and playing 3 card monte all over the place. You just can't allow such nefarious activities right there in River City.
Trouble with a capital "T" that rhymes with with "C" that stands for "cookie"...