It helps not to get too theoretical when it comes to morality. Someone that eats turkey and not vegetables out of moral conviction? That's not a sane thing to worry about and compensate for. There is a 0% chance of that being the case. If you worried about preferences that obscure/made-up you'd forbid every category of food, every color of food, every texture of food...
On top of that, it's very likely that every ingredient in the "turkey loaf" was something that would not be out of place in an actual turkey loaf. In other words, no ingredients being secretly added, just one being removed.
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.
On top of that, it's very likely that every ingredient in the "turkey loaf" was something that would not be out of place in an actual turkey loaf. In other words, no ingredients being secretly added, just one being removed.