One of the areas conservatives saw and then seized a chance to impose mental slavery was to demonize the 1619 project and Critical Race Theory (CRT). By undercutting and disallowing teaching of the past conservatives believe they can shape the minds of the future.
All of this circles back to Conservatives abject visceral hatred of Teachers; or more specifically Teachers' Unions. Years ago teachers were mostly women and made little money, but today Teachers Unions have ensured educators have good salaries and benefits, and more importantly have Political Power. That is unacceptable to right-wingers.
The American Right loathes the influence Teachers Unions exert on politics and have for decades. Under Ronnie Raygun school choice and creationism were the cause celebre. These days it's Critical Race Theory, transgender students, and sensible Covid mitigation efforts. But, whatever the phony issue brought forth by rightwing propagandists and uncritically repeated by Corporate Media stenographers the goal is the same; cut funding for public education and exert control on what young people learn and, more importantly, how they think and process information. As the splash page for the Arlington Heights, Illinois based "Christian Libtery Academy" quotes Proverbs, "Train up a child in the way he should go; even when he is old he will not depart from it."
American Conservatives have been engaged in a long struggle to halt change and turn back the clock not only on the Progressive Era of the 20th century but, on all advances for civil rights, since right-wingers lost the Civil War. A prime tactic conservatives used to undermine the United States has been infiltrating and subverting government at every level. Intimidating and Invading Public School Boards has always been a tactic used by right-wingers. For instance, here's the latest story about Ashley Sova, an Oregon III Percenter (3 percenters are one of the larger well-known rightwing paramilitary domestic terrorism organizations currently active) winning a spot on the school board.
Conservative Cancel Culture's goal is to defund public education, destroy Teacher's Unions, and control children's minds for the next and all future generations. Covid and CRT are just the latest false flag operations used by conservatives but, the goal remains the same