They forget that individuals learn a great deal with little or no schooling. They forget that experience teaches, and that learning by any means is part of a lifelong educational process. Schools of all grades and kinds are only one group of means in the pursuit of education.
A much better question to ask is: Who is a generally educated human being? The negative answer is easy; certainly not any person who has just earned a diploma: a degree, or some other sort of certification.
Source: Education
