Child is handed a baseball bat or a stick.
Crowd screams in what can only be called blood lust, "Hit it! Kill it! Knock it around! Harder! Hit it harder!"
The ancient concept of the sacred king, who is sacrificed for the fertility of the fields at the end of his reign, transmuted into the sacrifice of an effigy. England's Bonfire Night sees children throwing effigies of the traitor Guy Fawkes they have been carrying around onto the bonfire and screaming in delight as it burns.
Historically effigies have represented powerful figures, and even today the destruction of an effigy may be a political statement of discontent.
It is not that I am against piñatas. I have grown up with them, as have my children. But it interests me that there is such a violent undercurrent to them that we don't even really notice. Perhaps violence is in our nature the world over.
Sacred King:
http://en.wikipedia.org/wiki/Sacred_king
The Piñata:
http://www.mexconnect.com/mex_/travel/wdevlin/wdpinatahistory.html
Bonfire Night:
http://www.woodlands-junior.kent.sch.uk/customs/guy/history.htm
Political Effigies:
http://cultureandcommunication.org/deadmedia/index.php/Political_Effigies
Effigies as political statements:
http://www.guardian.co.uk/world/2006/sep/16/catholicism.religion
http://www.asiantribune.com/?q=node/12225