ADD vs. Short Attention Span

A.D.D. is caused by a lack of a certain chemical in a human's brain. But could the amount of that chemical be considered a part of that person's personality? Maybe, they just have a short attention span, and they were built with it that way. Is it correct for humans to control what might not be a flaw, but just a part of the individual? A short attention span might influence schoolwork etc, …

…confused with classes for children with problems. Some kids have problems that they are born with, like A.D.D., and we just have to accept those children for who they are and help them out. A.D.D., after all, is only caused by a lack of a certain chemical in a human's brain. It's not the child's fault. Though cures exist, is it right to drug all the children with short attention spans?