You must have missed the past 8 years because the left has suffered historic defeats all across America, and the trend will continue in 2018. I have 2 kids in public schools and here in our district in Georgia we defeated the Obama incursion on education. No one is forcing anyone to attend any particular college, look at the University of Missouri which has suffered dramatically as a result of its leftist activism. Leftist historians can write whatever they want, just as conservative historians can state the facts.
I agree with you in part, the left still holds a lot of university positions but I think parents are slowly waking up.
The left better hope like hell we never get another writer and historian like Shelby Foote.