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Exactly, your teacher should be a friend, not an object that you are deathly afraid of and dream of killing... and in general, it seems to me that a Sith cannot love, because he puts himself and power first.
Yes, and in KOTOR, Malak somehow uses his students either foolishly or intentionally. For example, Darth Bandon, who is he?
Essentially, their hierarchy is like this:
Darth Revan
|
Darth Malak
|
Darth Bandon
Does he really think that his student will be able to defeat his teacher?
The same goes for Bastila; he sees that she is afraid to fight Revan, he knows that she will lose, and yet he still forces her to.
P.S. Look at me, I fight for the light, I help everyone, but I couldn't resist Bastila's charm: D, but that doesn't mean that the Jedi Council will chop off my head for it...
Here is an example for you.