A civics course for high school kids wouldn't have to go into all the nuances and complexities of CRT as it's done in universities, but why would it be a threat to teach, as a factual part of American history, that there were racists laws, treaty violations, and institutions in our history? Jim Crow, 3/5, Fort Laramie, chain gangs, segregation,
etc. were all real things -- to teach students about them is to teach that our past is checkered and that our union isn't perfect and that past mistakes reverberate today. It doesn't teach "hating our country" -- DeSantis is a lying sack of shit and an ignoramus. These truths about our past are truths high school students would have the cognitive skills to ponder. Maybe middle school, too.