That person you are yelling at in the mirror. It's you! It's not one of us, but rather it's you.
Even Hanabiko ("Fireworks Girl" (literally "flower-fire girl"), AKA "Koko") knew that the gorilla in the mirror was her. And you still haven't been able to grasp that simple concept.
For the same reason why proselytizers are vile, evil people. Their purpose and goal is to attack the beliefs of others in order to destroy those beliefs and replace them with their own.