Do I understand you to mean that you beleive that fattened ducks are suffering as a result of having a diseased liver and it is that suffering that you object to rather than the pathology per se?Heck, I even eat water bamboo that has had its stalks bloated by a deliberate infestation with wild rice smut. It's delicious. But it doesn't answer to the name of "Wilbur" or "Donald."
I'm sure Gary also avoids late harvest wines and any type of bread (which as we all know is wheat flour that's been infected with yeast)
If so, fair enough, but I think you then have to answer rancho_gordo and omnivorette's question on the cruelty of factory farming in general.