I agree that if a child was possible it would not necessarily be evil. HE/she would have had some kind of internal good/evil conflict!
On morgoth's thoughts, rape was most likely what he had in mind. Another kind of torture probably would not have been as effective (Thingol would have gone off on Morgoth regardless.) Setting aside the fact that Luthien would have "died" if Morgoth tried anything, simply violating her would be enough to provoke a response from Thingol. Luthien would have been so humiated/broken/sick that I can't imagine any thing else for her spirit to do than depart. Morgoth also has that power obsession that characterizes rapists. The desires that Morgoth had toward Luthien seem to be the culmination of his evilness, his desire to corrupt something so pure.
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Before these fields were shorn and tilled,
Full to the brim our rivers flowed;
The melody of waters filled
The fresh and boundless wood,
And torrents dashed, and rivlets played,
And fountains spouted in the shade.
-Bryant
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