In the spirit of holiday generosity, today we offer not one but 12 great stories, each of them about one great TV series — one of the all-time best, as a matter of fact. The magnificently profane, frequently gruesome 2004–2006 HBO drama Deadwood might not be the most obvious choice of holiday-nostalgia viewing, but as New York’s Matt Zoller Seitz has unpacked over the course of “12 Days of Deadwood,” his project revisiting the series’s first season, David Milch’s revisionist Western is at heart a story about community, examining the interconnectedness of humanity in philosophical, political, and theological terms. Warm and fuzzy it is not, but as Seitz concludes in this essay on the show’s season-one finale — the culmination of his daily deep dives into each of the season’s 12 episodes — “For all the gore, madness, and opportunism … we come away with a feeling of hope for the camp, for its characters, and for us.”