I don't know I think it's too broad to categorize people in such a way. 

I know someone with an Aquarius Rising and Capricorn stellium in the 12th and he's been a very kind friend. He has his shadow side but it's directed more inward towards himself than others.  Further, like a lot of 12th housers, I think he struggles to see when others are taking advantage of him.

On the flip side, my ex is a Sagittarius rising with a Scorpio stellium in the 12th and he for sure has some sort of personality disorder. I don't think he's evil, but I think he was traumatized as a child and now is a prisoner of his own self undoing, since he has been unable to integrate his shadow and thus is a mess of self-hatred that inflicts pain on others due to his narcissistic tendencies. But I wouldn't want to assume all Sag risings with a Scorpio stellium in the 12th are like him.