Historical drams are never not a little seductive. They have a head start by being based on people who existed in situations and carry a halo of intrigue because "this really happened." More or less. The liberties taken with historical events get taut and then slacken from scene to scene and from moment to moment but if they're well presented we follow along as with a magician's illusion. A dramatist will insist that the truth is revealed in fictions that reveal larger truths but a lot of the time they are just exposing their own shortcomings. I've seen one episode of the Truman Capote series Feud  and so far it holds my attention even though the writing occasionally clangs. When done well, period pieces becomes a peep hole into history allowing us to play God by being present in private moments and at the confluence of events. Unseen. It's a neat trick. And ironically it gets at the heart of what this story is about. Depicting the private lives of others with reckless disregard for the consequences.