Suicide in Middle Earth

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Welcome to the Downs, Vaine.

Originally Posted by Vaine

Practically yes, although he did 'ask' Gurthang (His sword) if it would be so kind as to end his life, before he let his body fall on it's edge

Another example of 'suicide' for the greater good and for hope. Turin made a mess of everything he touched and everyone with whom he formed a relationship and so, to him perhaps, exiting the stage would further the cause against Morgoth and cut short the mayhem that the dark vala hoped to continue via the CoH. Níniel/Niënor may have felt the same.