The most famous feral child case in history is a girl named Genie, who was abused because her single father had autism and noise sensitivity. He couldn't stand the sound of crying, so he locked her in a room and beat her if she cried. She learned that making noise was bad, and never learned to talk. When she was rescued, she learned a few words, but never how to use them properly.
And you want me to believe that's not as bad as narcissism. You want to minimise Genie's abuse and my abuse, because our parents didn't have the "right" disorder to call out. You're a disgusting abuse enabler.