Tsukuyomi herself pretty much said that she has no Freudian excuse or even overriding motivations, though. She just enjoys killing stuff, particularly when that stuff puts up a good fight. I always got the impression that she's centered on Setsuna primarily because they use the same style of combat and are at similar levels of power, so the fight will be long and vicious before one of them goes down, which is exactly what Tsukuyomi wants.
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