In 'Disaster of the Gladden Fields' in UT Isildur tells his eldest son he cannot bend the Ring to his will. He also realizes he's made a mistake in keeping it and plans to turn it over to 'the Wise', (which might not have been the best move either). This of course is why the Ring 'betrays him to his death' because it knows it's lost it's hold on him.
As for Boromir, why is he *never* given the credit he deserves for mastering the Ring's temptation and repenting? His apotheosis after death is proof he died clean of the Ring's taint. Something he achieved all by himself without aid from anybody, (except perhaps Eru).
And movie Faramir *never* wants the Ring for himself, anymore than his literary alter-ego does. He intends to send it to his father in Minas Tirith for Denethor to keep or use in the defense of Gondor. Nor is it hard to see why he might consider this a better alternative than sending the Ring into Mordor in the hands of a mentally fragile Hobbit accompanied by his gardener and a creature suffering from advanced MPD!
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