What Mentar is doing is presenting a false dichotomy, a logical fallacy. He's trying to present only two options: that Kyube is good, or that he is evil. And if he can rule out the former, than he can force you to believe the latter.
The reason why that reasoning doesn't work, is because there are more choices than just good and evil. Quite a few of us have been calling him amoral.
But hell, even given that dichotomy, Kyube is doing "good" by helping to get rid of witches that are plaguing humanity! So it's not even a very good false dichotomy.
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