Maybe not so much the loss of the light of the Trees...
Weren't the Trees detroyed and then the Valar made an appeal to Feanor to give of his Silmarilli to return life to the trees? Feanor turned them down and returned home, only to find that his precious jewels had been lost.
Then Feanor went a rampage of vengeance and retrieval. Feanor cared only for his creation, and he was the main instigator of vengeful thoughts among the Elves of Tol Sirion.
That's just my thoughts,
