Talk about retroactive abortions. And it's a beautiful conclusion in that Lana's decision seems natural, understandable, good, and yet evil all at once... it's justifiable but still represents her own moral decline. Her boy perceived she never loved him, abandoned him, and threw him away like garbage, but she hadn't really done that per se, so his understanding was wrong; but in the end, his understanding was actually correct, and his vulnerability occurring when he accepted her narrative led him to exactly the same fate that he believed he had already befallen. just absolutely brilliant in that context.
Also, even before the final scene (the flashback to Jude and Lana in the asylum in 1964), there are clear parallels between Jude and Lana in terms of character. Both are very ambitious women working against a masculine system, trying to establish a foothold for themselves, and they can only do this by acting preemptively and really looking out only for themselves. Both actually spent time in the asylum and had their sanity challenged. And at first, Lana felt that Jude was evil and she was out to bring her down as such, and we were inclined to agree at the time; but in the end it is Jude who found redemption of sorts while Lana was the one who was devoured by her ambition and ruthless pragmatism even while achieving the trappings of power both women at one point had hoped to accumulate. I personally felt like the flashback was a little TOO much 'connecting the dots' since I had already seen it, but I guess for a drawn-out series over a number of weeks, it was important to bookend things in case people didn't catch that connection.
The entire last scene between Johnny and Lana, also, when she is stroking his face and calling him a "dear dear boy" gave me chills, because to me she was channeling Jude (in the kinds of words used and the acting) during Jude's dark power trips at the asylum... and just like Jude would do when she was in charge, the soft sibilance of the snake in the grass resolves itself with one large, deadly bite. At the end, Johnny gives up his power and anger over her because he is just the baby wanting his mother's love, and babies do not have power if they want to receive; and instead of giving (or worse, she is just PRETENDING to give while having other intent), she behaves what we would see as the antithesis of motherhood ... instead of bringing life, taking it.
Maybe Mary Eunice was actually "possessed" by a demon; but evil lived most productively in Jude and Lana, as a matter of their choices as human beings -- evil by their own volition -- and Jude eventually won grace, while Lana... well, it seems that her soul's status is far more dubious.
Madness = a web of lies and deception and half-truths that mirror actual truth, leaving it unclear what is true vs not.... beautiful beautiful ending to this season.