The poor sanitation in American poultry farming can have other negative effects outside the meat being safe. Such unsanitary conditions make dangerous conditions for workers including an elevated risk of novel avian flues and, if ever the chlorination isn't properly executed, the meat is extremely unsafe to eat.

Chlorination is a good idea when you can't control the supply chain (i.e. drawing water through infrastructure that's been compromised) but the better solution (if it's reasonable) is always to fix the supply chain. In the case of a city relying on chlorination vs. bringing clean water in by train the chlorination is a clear winner. When it comes to meat it's a cost issue and the EU made the decision to force that cost onto the producer while the US has made the decision to bear the cost at large.