Gildor's got a gun

[alatar]

Hobbits - Eru's silver bullets.

Someone brought up political assassination. What of 'emotional' assassination, as per Denethor? He was driven to despair, and when it became too much, he took a flying leap.

Could some on the other side be made ineffectual - despondent - in the same way? Aragorn taunted Sauron, and must have caused the maia some anxiety. Could he and, say, members of the White Council use the palantiri or other methods to neutralize Sauron and/or other threats?

Again, my larger question is why the 'good' did not seek to hamper and harass (with extreme prejudice) the evil? Like, in an odd way, could Galadriel have sent a betrothal request (between her and Sauron) back with one of the Nine (on its way back from Dale) just so she could turn him down when he got his hopes up?