Dyslexic children who could not read but can read as adults

I have read many articles about adults who were unable to read in school as children but have learned to read when they were older.

The questions that arise in my mind are: “Why is this so? Why is it that they could not read when in school but are able to learn to read when they get older?” I believe the answer is simply that as an adult they can reason out and realize that they have been trying to learn English in a logical way when many of the words are not spelt logically. When this realization sets in they have no problem learning to read in English. There is no underlying reason (except perhaps that they had not been taught the way they should have been taught) as to why most of them had not learned in the first place.