The history of state education, especially in America, is pretty dark. John Taylor Gatto, former teacher of the year in New York several times over, has written extensively on the history of education and it's worth reading his books to understand why state education seems so bad -- basically because it's working as intended. Our current education systems are damaging our children's emotional and intellectual independence, and do not serve the hopes and wishes most parents have for their children's education.
Voluntary options to state education should absolutely be celebrated, and parents should have the freedom to choose how to educate their own children.