Because apparently children are safer and more productive in a no-rules environment:
Charter schools are public schools. They do not charge tuition. They are completely funded by the government. They cannot teach religious doctrine. But they have huge advantages over traditional public schools. They are freed from most, but not all, state-imposed rules that strangle the creativity of schools and teachers.
It would take this entire page to list all the stifling rules charters do not have to follow.
Okay, maybe you can list ten of those "stifling" rules, so parents can get an idea of what not to expect from the school they send their children to. Five? One? Or maybe you don't want to go into detail, because you know most of those creativity-strangling rules were put in place to protect children from idiotic nonsensical demagogues like yourself.