I'm pretty sure most of them have no real idea what they're complaining about, other than what the angry man on TV told them. See the giant, nonsensical hubbub over "critical race theory" a few years ago, as well as stuff like this: https://www.nytimes.com/2023/01/19/us/desantis-florida-ap-af...

There are probably legitimate criticisms of recent changes to public education, but it's never the things that Republican politicians harp on.

Also, for what it's worth, much of what my generation was taught in school was utter bullshit: https://en.wikipedia.org/wiki/Lies_My_Teacher_Told_Me. If anything, the idea that my children would be taught that the Pilgrims and Indians were best friends, that Columbus was someone to look up to, or that the Civil War was really about states' rights is what would compel me to homeschool, not "liberal indoctrination." But many, like DeSantis, still appear to believe that these lies should be taught.