No...they were taught by their classmates, their classmate's parents, half the teachers in their schools, the ubiquiteous television.
To the extent science classes indulge in hopeful reconstructions of history they are indulging philosophy in the name of science.
What sonorous codswallop.
What, exactly, would be the "hopeful" part of, say, the story of the first glimpse through a telescope of Jupiter, or the first glimpse, through a microscope, of a microbe?
So, your right. There are philosophy classes in grade school, intoduced, of all things, through science classes.
That is your silly, paranoid opinion, bizarre as it is, and you are welcome....oh, the heck with it, you ought to be sued for slander, were science teachers a single person who could sue.
The hopeful part is in constructing from these observations a cause and effect history that begins with unguided chemical combinations and results in intelligent, self-aware entities.