It's worth pointing out how different (and better) Jedi Knight's morality system is from the "Bethesda model", in which you play as good/bad but at the end of the game, it doesn't matter and you get to make the Big Moral Choice (purify the water or POISON EVERYONE?).

In JK you are never asked explicitly, "Do you want to do a Good Thing or a Bad Thing?". After a boss fight, you can choose to kill your opponent, or not. Those civilians running around sometimes drop health packs or ammo when they die, so maybe you kill them, or you don't. Dark side force powers are awesome, and don't require ammo to work, so maybe you put a few points into them. Then, at about 3/4 through the game, it doesn't ask if you want to be a light or dark Jedi, it tells you what kind of Jedi you were all along. You get to the point where you might expect the game to offer you a Big Choice, but instead, it points out that you already made your choice when you weren't paying attention.