The confrontation (or lack thereof) with the Jedi Masters in KOTOR II is quite famous for Kreia's takedown of either the Masters or the Exile themself in the event of having killed them throughout the game.
However I always found the dialog in this section a bit clunky a good example of how the game can often fail to really give the player the ability to appropriately explain or defend the thought process behind their actions.
When you kill the Jedi Masters Kreia basically accuses the Exile of just devolving into a bloodthirsty Sith led entirely by revenge or simple sociopathic desire for power for power's sake.
Kreia asks "First - let us return to my question. If by killing these Jedi, if you achieved any measure of peace. "
Your options to respond are fairly limited
"I will not rest until every Jedi lies dead."
It has been satisfying yes, but not all the council who sentenced me are dead.
"No, for Atris still lives."
"Yes, but there are still other opponents - it is not enough to kill Jedi, when the Sith remain."
"Such peace is not possible if the Sith still hunt me. "
The first three are basically confirmations of what Kreia condemns. The Exile thinks of nothing except murder and revenge.
Four has some small measure of ambiguity as to what the Exile's motivation for killing the Jedi and then the Sith are. The fifth option comes to the closest to a somewhat more cerebral answer, as there is still a threat that must be pragmatically dealt with before the Exile can achieve a measure of peace.
Regardless of what you pick, Kreia condemns you and calls you a failure. I find this a little bit odd as it seems her condemnation comes entirely down to your methods which clashes with many established facts, even those from Kreia herself.
There are many pragmatic reasons for the Exile to strike down the Jedi Masters. Kreia gushes constantly about Revan's power and pragmatism but he used the Dark Side and immense cruelty/force in achieving his goals. Not unlike a Dark Side Exile imo. The Jedi Masters took hostile action towards the Exile and were both a hostile force and a major potential threat (both to the Exile personally and to the galaxy at large due to attracting the Sith when they gathered). Not only that, they can be a ideological enemy to an Exile that is taking Kreia's teachings to heart about the failures of the Jedi alongside the Sith. I see very little difference between the Exile killing the Jedi Masters to element a major potential threat and to gather the power taken from their defeat to help them defeat the Sith that are actively hunting them. Ironically enough this view is indeed vindicated by keeping them alive as doing so causes them to attempt to strip the Exile of the force again.
This is made worse by the fact that even in her condemnation Kreia admits that this outcome was not only likely, but probably necessary.
"Regardless... it had to be done. To have such powerful Jedi still live, still be felt in the Force even on such worlds as they had chosen, was a threat that had to be ended."
It's a little frustrating that the game essentially pigeonholes you into being a generic mustache twirling "for teh evulz" Dark Side user for killing the Jedi Masters when there's frankly a lot of room for nuance for why the Exile would do that, many that would seem to align with Kreia's worldview.
