People are not dumb because they are cognitively incapable. They are dumb because they have chosen a narrative that impedes them from progressing psychologically and growing beyond a human’s default ignorant state. For example: Believing that you can’t do something because you tried and failed. This mindset is reinforced by a narrative that you are incapable of certain things so you shouldn’t try. Or that ‘who you are’ is innate and you can’t improve and grow, these are narratives that people tell themselves that keep them flawed, dumb and ignorant.