Ayn Rand had a 79 word statement on why Thanksgiving should be celebrated:
Thanksgiving is a typically American holiday. In spite of its religious form (Giving thanks to God for a good harvest), its essential, secular meaning is a celebration of successful production. It is a producer’s holiday. The lavish meal is a symbol of the fact that abundant consumption is the result and reward of production. Abundance is (or was and ought to be) America’s pride–just as it is the pride of American parents that their children need never know starvation.
But let’s just get to the point and say that we’re celebrating life.