Same thing exactly with understanding/perception/comprehension. People are born the way they are. See what they see, hear what they hear, think what they think. They aren't responsible for any of it. It is their capacities/inadequecies/strenghs that determine all and they have no control over it whatsoever. They had no choice. They were born that way. D'ya suppose we should cut one another some slack since we aren't responsible for what/whom we are? If you must place blame with anyone blame the first set of parents whose DNA set the template. How far back do we go? As far as we hafta go which is?