I think there is a fair dose of what you describe, but I think we have a major systemic problem. Our public schools industry is dominated by Democrats who indoctrinate, rather than educate, America's students. I encourage you not to refer to our "education system". It has become a mere industry, focused more on the livelihood of the teachers and bureaucrats who run it rather than on the students.
The Left quite consciously encouraged its adherents to infiltrate the schools to influence thinking at a young age. It absolutely starts in elementary school, and by the time they graduate high-school, most kids have been thoroughly indoctrinated. Give them another 4 yrs of college - where they are enraptured by their "professors," and (cont'd)