Not a fan of many Smith movies but I like him, and still do. He's a cool guy and he's rather smart. Hate on him for his work, not his beliefs
If one would be inclined to criticize Will Smith, it would be for his actions and not his beliefs. Financially supporting a corrupt, unethical organization is an action, not a belief. Founding a school that will brainwash children into a money sucking cult is an action, not a belief. Thus I would be criticizing him for his work!
Anyway, why are beliefs beyond criticism?
I believe that the moon is made of cheese, that gay people should be killed, and that women shouldn't be allowed to vote. These beliefs are sacrosanct and should be shielded from all criticisms.