I need to point out something, lest others think I'm being critical of decent and civilized people who have something not turkey as their main course on Thanksgiving, Christmas, and New Year's Day.
Usually they have something else because it's a long standing historical tradition. My mother's people, in northeastern Pennsylvania, for example, always had pork on New Year's Day, apparently a tradition from the Old Country, Slovakia (I spent holidays with them, but somehow by the Grace of God always got turkey).
Decent and civilized people do such things because it's tradition.
Primitives do the same thing--non-turkey cuisine for the holidays--but for a different reason.
Remember, there's always a base, malign, sinister motive behind anything, no matter what it is, a primitive does.
Primitives like to imagine themselves rebels, iconoclasts, "different." And what better way to get back at decent and civilized people, than by rejecting their core beliefs and values, including turkey?
For the primitives, that's all it is, nothing else.