Who should be blamed for the toys and other chinese product recall conundrum?

Obviously Chinese manufactures will be blamed and punished for what had happened, and they should be. However, The US companies did make gazillion dollars because of those low-cost-high-profit cheap products. What happened to the product quality control before putting the product on the shelves? There are the Chinese government, US government, exporter, importer, the company itself, and the retail store between the Chinese manufactures and consumers.