[LePetitChoux]

In the film Elrond says smth. like "I had this one chance to destroy evil forever" and then looks really guilty. But maybe it was kind of like the paradox: "Is the happiness of the world worth the tears of one child?" meaning, that if you hurt a child then the world will be happy (thats kinda obvious, I guesss). This is a little like Elrond's dilemma-if he forces Isildur to throw the ring into the Cracks of Doom, or throws him in with the ring then the world will be safe, but its safety will be because of the death of a man. Also, if he had killed Isildur then Gondor would forever hate the elves, 'cos their ruler was killed and their Monarchy disrupted over a small ring of the evilness of which there was no proof anyway, by the ruler of the Elves,(or one of the rulers of the elves).