i wouldnt call it INSANE ush, perhaps incorrect.
anyway, the arguement i was stating was that yoda did not use force lightning simply by deflecting it. and yes, why should yoda care whether or not it hits dooku right between the eyes, the line had already been crossed.
"It;s not impossible that only Hatred can cause Force Lightning, but we can only speculate. Indeed, we have never seen a Light Sided Jedi do it, but that;s not necessarily definitive. I have no problem thinking they canot do it, though."
now, in your statement ush, you went from "its impossible that only Hatred can cause Force Lightning" to "i have no problem thinking they (the jedi) cannot do it"
does that mean you think that a jedi not using force lightning might simply be a matter of etiquite? well, i must argue that such a move is motivated by hate.
"only now in the end do you understand...."
(as palps zaps the living crap out of luke, with nothing but hate in his eyes)
"....your feeble skills are no match for the power of the dark side."
that tells me that the dark side presents its own powers, not just an upgrade of already existant jedi powers...
EDIT> good observation NoFate, and remember luke's test at the cave in ESB...he ignited his saber first...and at that point i reckon, he had already failed the test.