Both Elrong and Thingol were very wise and saw far ahead.
Maybe the reason that Aragorn succeded with all that he did was Elrond's promise of a great reward.
My interpretation is thatn it was not evil, it was out of deep concern for ME.
With Thingol I'm not so sure, he was a bit selfish and suspicious. Maybe a subconscious concern.
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And with that he lifted high his sword and flames ran down the blade
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