The great advantage of the Left in attacking heritage over the past century, has been the diversion of bright students away from the verbal arts and culture related subjects, by the explosion of new business opportunities to better provide for family comfort. Thus those family oriented & conservative are far less likely to be defending their culture, while the ideologically weak and less cerebral are left largely in control of education.
This recognized, one should realize the opportunity created by the new Leftist wave in the Democratic Party, could provide a very long overdue wake up call--but, of course, that depends on our proper response to that opportunity.
Once a new generation starts to get their teeth wet with the ease of demolishing the canned arguments of the Leftist charlatans & mountebanks, the pendulum will swing back.
Here are a few suggestions that might help:
Social Reform: Confusion & "Unintended Consequences"
You raise a very good point, which is no doubt the reason why the Left is working triple-overtime to censor us on social media and to render our opinions the political equivalent of pornography.