To answer the OP's original question--NO!
Each person will, and has defined a set of ethics in the sport of hunting. The area most hunters define as the vitals where a shot takes out the lungs/heart has always been, and will remain where I make my shots. Head shots with archery tackle violate my personally defined set of ethics, and hunting rules. Our state has a very large number of hunters. Each one of those hunters has their own defined set of ethics, and goals. Sadly the mixed bag of ethics, and personal expectations of the large number of hunters can, and will have a direct effect on other hunters.
Getting back on track--HEAD SHOTS?--NO!