Thanksgiving movies are a little more iffy for the networks. Unless your network is targeted for a demographic that won’t have any objections, like the Hallmark channel, then you could leave yourself open to protests from people objecting to the treatment of Native Americans.
Christmas movies are just the safer bet.
For things like this I always rely on the Robert A. Heinlein quote. “Whenever you ask, Why did “they” do this thing or that, the answer is always money.”