To conflate one of the more noble activities of civilisation with one of the least and deservedly loathed seems to avoid the distinction of the purposes of each that a careful use of the two words avoids.
The purpose of education, broadly and practically considered, is to provide a common stock of knowledge on which to further build, and to teach the methods and procedures to allow an individual to be able to free himself from the tutelage of others. This common stock of knowledge has been built over time by many influences and by many independent, striving and often antagonistic influences and perspectives, much as science continually corrects itself.
The purpose of indoctrination, on the other hand is just the opposite; to inculcate one chosen perspective by any means, including propaganda, and to never teach either any other perspective nor to provide the individual the tools necessary to think differently. Its dogma is never challenged---or allowed to be challenged--- by reality or contrary thinking in its origin and stunted "growth" of elaboration of the same.
While educators may have opinions about all sorts of things, they also take this "bias" into consideration, and attempt --- as much as is possible--- to bracket them. Indoctrinators do not, and it is their opinions that determine the content of instruction.
More often than not, at least for the average person, self-education is actually self-indoctrination and not education, and is based more on happenstance, contingency, and caprice than anything else. Stunted, slanted, or incomplete knowledge seldom leads to authenticity in thinking, and often to sad consequences to the individual and to the society in which he lives.