Nope. I make a point of avoiding chain stores. The point remains, even if neither of us buy our groceries there, many people do.
I'm not really sure what you point is though. It is hard to find a chain store that doesn't have some sort of connection to a horrible vendor. It is unrealistic to expect them to have perfect oversight AND manage to get products to stores at the lowest prices. I do support consumer driven protests that bring this stuff to light, of course, and you tend to see the chains cut ties with vendors with this type of reputation pretty quickly once the consumer protests start rolling in.