You happen to be wrong, I am a counterexample (I don't eat soy, and yes, for moral reasons), but I won't explain, because I don't have to. And what I am saying is that I shouldn't have to. Sure, you can decide to believe whatever you want on your own, but when it makes you justify feeding things to me that I have resolved not to eat, that's downright violating.
I meant someone whose morality specifically insists that there be bird meat. Sorry for being unclear.
So again here there is a difference adding a problem ingredient, and there being an ingredient you don't put in. For the former you need to ask about dietary restrictions and respect that. Which they did. For the latter, I don't think you're in much risk of violating anyone's moral system.