'Death comes swirling down' is one of Homer's favourite stock phrases in the Illiad. Just part of my convoluted nod to the father of all epics.
As for the motivations of the Dunyain, RAFO! Remember too that the Dunyain do not pretend to have overcome the darkness that comes before, only to much further down the road to the absolute than the worldborn. There's much more on this is TTT.
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