In our local schools things are not going as badly as it appears they are in other localities. There is a fair amount of liberal bias in many areas (Civics and history, for example. We combat that stuff at home. Public education is unknowingly preparing our kids for what they will see in college and in the world— a liberal agenda that can be successfully opposed (at least on a personal level) by logical examination of its tenets. We are working to teach that to our 16 year old boy/girl twins. I would prefer not to have schools attempt to indoctrinate my children from any perspective, but to the extent schools push a liberal slant, it is being done while thinking parents can use the situation as an opportunity to teach logic, morals and critical thinking.
There will always be a “slant” to education — whether public or private. But a public school should reflect the community’s standards and culture.