Your definition of hero is too narrow is the problem.
If you wipe out The Absolute from a desire for vengeance on those that enslaved you then you improve the world. It doesn't matter that it was a bloody path or that a lot of extra people got killed that didn't need to. The world is improved and baldur's gate is saved.
Not that I disagree with the general net positive sentiment, but does that mean Stalin is a hero because he helped defeat Hitler, even if a lot of extra people got killed?
The smart answer to that:
Ha! I'm not touching that with a 10-foot pole!
In that interview, which I had previously seen myself, Swen not only confirms DU was a serial killer but also openly refers to DU as a psychopath, exactly as I described the character right from the beginning. He then asks whether, if such a person has amnesia, they are still that same person? The answer to that question is not at all complicated. It is indisputably 'yes.' And for me, it is very troubling that so many people seem to believe that playing a psychopath can be "interesting" and "fun." My two cents.
Why do you hate democracy?
And didn't Knights of The Old Republic do this? You could play an evil Sith with your psychopathic assassin robot? That was a hoot.
Also, calling an incarnation/avatar of the Lord of Murder - infused with the divine essence of Murder itself - a psychopath, is a bit reductive.
