They have judged, and found you lacking.

The Dark Urge is an origin character just like the others, part of their backstory is going to be fixed just like Astarion or Gale or any of the others. If you want full customisation of how you want to play your character then play an evil custom character. I don't see any issue with how Larian handled this, at it's how they expose The Dark Urges backstory to you.