I think the key term with Boromir/Ring and Denethor/Palantir is despair. Father and son both despair of the ability of Men -- unaided -- to defeat Sauron. Boromir's despair of his own ability to save his kingdom leads him to the desperate attempt to take the Ring; Denethor's despair drives him mad.
They both sort of get it: "Not by strength of arms alone will this war be won" (or whatever it is that Aragorn/Gandalf? says). This much they realise, but they are unable to see any other hope. If the sword is not sufficient to save them, what is?Boromir gives way to the illusion that the Ring will save them, Denethor gives way to the illusion that nothing can save them.
This all highlights how the motivating factor for the heroes is not faith in themselves, but faith in. . .well. . .the benevolence of the universe. In other words, they cling to hope, despite all evidence to the contrary.
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Scribbling scrabbling.
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