I would go to the source of all troubles in the Silmarillion, Feanor and those Silmaril. If it had not been for those Simarils, there would be no oath or doom of the Noldor.
However it would not be fair to leave Morgoth out of the blame, as he destroyed the two trees and created the arguement between him and Yavanana. Morgoth was also the one who was spreading rumours and lies.
I suppose I will have to change me blame to Morgoth. Eek! I have now realized that it is a succsive chain of people, without one person, another thing would have not happened. The stories rely on each other for each other's doom.
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Mes sana in corpec sano- (lt.) A sound mind in a sound body
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