I guess what it is is that too many people are willing to believe what the government schools tell them to believe.
Back in my day, public school wasn’t perfect but I never got the wrong impression. I just comprehended it better than others, maybe. I also had a mother who adored the Founders and possibly kept me on the straight track better than most schools would.
On a slight tangent, I’ll never forget in HS a boy answering teacher’s question, about the Korean War, comparing Korea to Civil War US, “but this time the South was the good guy”. Rolling eyes. ;-)