Where do you draw the line with gang signs and advertising? You can find some kind of symbol in almost any advertising using a hand. Take the successful Jeep Patriot campaign - a woman playfully pinches a wolf and drops it into her friends canoe. One could say that the pinch sign (see # 8 below) is used by some obscure gang somewhere that doesn't really matter.
Should that gang sign limit creativity and stifle the Jeep campaign with its pinch the wolf theme? Of course not.