That's why education has to try to be as objective and apolitical as possible, and when the two are at odds, choose objectivity. And accept that it's never going to be perfect. Nobody is ever going to agree on where that sweet spot is and there will always be segments of the population who vociferously disagree with how some things are taught, but as long as there's a critical mass of educators making good faith efforts to achieve those ideals, the result will be imperfect but better than kids being taught random things (whatever their parents want to indoctrinate them with) by random people who aren't professional educators (the parents doing the teaching). I'm not arguing against homeschooling here, just arguing against the nihilism expressed by the parent post. I'm fine with homeschooling as long as there are educational standards and it's not just parents who want to brainwash their kids.
FWIW I was partially educated in American public schools and got no shortage of what many would consider to be anti-government messaging, at least in the sense of being encouraged to think critically on my own and taught about all sorts of occasions where people's moral convictions went against government policies so they protested or went into government or whatever to change it for the better. I also got no shortage of focus on all of the ways in which America did terrible things in the past: Native American genocide, slavery, Japanese internment camps during WW2, Jim Crow laws, etc. The focus was always on why those things were bad, how they got changed, and how understanding those things helps us perceive normalized shittiness in the present day so we can fix it and make things better. Nothing's ever completely fixed, history is just an endless process of things (usually) getting marginally better over time in the aggregate.
I'm sure there are lots of shitty schools with shitty teachers that teach blind obedience and tribalism, but those are shitty schools with shitty teachers and they need funding and improvement, rather than throw our hands up in the air and say there are no standards and no truth and everyone just believe whatever. If nothing else, education at least needs to expose people to a range of things they wouldn't be exposed to if left to their own devices, and help students learn critical thinking so they can make their own rational choices about things.
Also it's not like parents give up all rights to educate their kids when they don't homeschool them. They can teach their kids all they want about whatever they want, including things that contradict what's taught in class, for better or worse.