Shooting at Puma factory in Cambodia

Despite the increase in social audits in countries like Cambodia, China, and Vietnam, the incidents of worker unrest have risen. Here's a recent report from Reuters discussing a serious incident in one of Puma's factories.
http://www.reuters.com/article/2012/02/23/puma-cambodia-idUSL5E8DN8S820120223

This suggests to me that auditing factories to company codes of conduct is not having the desired impact on workers' lives. I'm sorry if you have heard that from me before, but it really pisses me off .
How many more articles like this will it take to pursuade Brands to look at the root cause of worker unrest instead of uncovering the symptoms.