I suspect he is, he thinks he is the ultimate moral authority (he distrusts everyone) and backstabs those whom deems in the wrong. If he can he has no compulsions to kills those he disagrees with if they do not give in--even his comrades.
How can you trust that what he claims as his reasons are really his reasons?
I do not agree with the means Illidan uses all the time, and I prefer advisors who can give their own input, but I'd rather bring those up myself than have someone I cannot trust at my back. With what I learned of Kayn he kan think, and he sometimes disagrees, but he is unlikely to stab us in the back whereas with Altruis I would have to worry that the moment I have a disagreement with Illidan he would fall both of us in the back. I couldn't leave him in charge when I have to look after something else for fear of him no keeping to what was discussed before but deciding to follow his own "morals". He might be alright as advisor, valuable even, but I cannot see him in a position of power. He has shown himself loyal only to what he himself precieves as right, if, as someone here pointed out, every demon hunter is in danger of being corrupted, then he seems one of the most endangered. When he puts his own judgement above all else and kills those he disagrees with, then what happens when he gets corrupted? Would he even notice? Would we? Maybe he is already.
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How do you know? Just because Altuis says so? Wouldn't that make you one of those people you cannot stand? Because you blindly follow one person disregarding all others?
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Yes, Altruis biggest fault is that he thinks he is without fault and everyone who isn't of the same opinion as him has to die, a sure sign of corruption by power.
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I agree, but this is storytelling, we do not get all the choices that might be possible.
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In retrospec we cannot even be sure that was "the evil part" and he was "the good part" of whole Akama.
It could have been reversed, or more likely both had good and evil parts.
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I know, but I wanted to point out the downsides of those.
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Well, the quest text said something like: "Look into the pool and watch a summary of the two choice'S past actions and characters."
What do we get instead? Something about Illidan that should have been shown right after the character creation and not when we decide among two prospects for our second in command who whe are supposed to have had a long history with being in the same order for years allengedly.