The human mind, when presented with two opposing 'things', will ALWAYS choose the more familiar.
It has NOTHING to do with the 'right' or 'wrong' -ness of the things presented; but how well they KNOW the items.
Thus, the thorough 'schooling' that they receive.
No; they do NOT think of it as indoctrination; because it comes from folks they trust.
What is the fallback excuse for those who do NOT toe the line?