Yeah I would say high kicks are risky, and I don't know about else where, but in Texas, as soon as your foot contacts someones head, its assualt with a deadly weapon. The highest kick I have ever used in a real life situation was to the sternum area. Often in a fight low powerful kicks will make your opponent keep more distance and gaurd down low, plus they have a lower likelyhood of getting your foot grabbed or opening up your groin to an attack.