You can't have a non-polluting China, and cheap crap at Wal-Mart.
China is a country capable of deciding what it wants for itself. If it wants to be a factory, then that's what it will be. It's "grown up" enough to make its own decisions and be held accountable for them. Blaming the west is just that; trying to redirect the blame.
I say good, let manufacturing move back to the countries they came from. Let them operate under actual regulations. It will be slightly more expense, maybe, but the air will be cleaner. That would require China to do its job and enforce environmental regulations. Which they're not willing to do because profits... So no, the west gets none of the blame here. It's 100% China. If a gang war broke out over drug dealing spots, would you blame the drug user for the violence? Of course you wouldn't. The dealers are the ones responsible. They have free will and can choose to be violent, non-violent, or not deal at all.