Celeborn

[GreatWarg]

I suppose it was Celeborn's traumatic young-elfhood, but he seems like one whose better nature only comes out in his second thoughts.

Elu Thingol was slain by Dwarves. There is the simple answer. Celeborn must have grieved for that. And why wouldn't you hate the slayers of your kinsman? The Elves were divided during the kinslayings.

Also, Galadriel was a Noldor. Elrond was partly Noldor. Celeborn was Silvan. See anything there? The Noldor are usually wiser in lore and have the greater power than the Silvan Elves, but the Silvan Elves knew more about the beasts and the plants that grew in Middle-earth.