Nor is having an MD and a state license the indicator of a good doctor but it establishes minimum qualifications.
The best teacher I have ever seen is a homeschooling mom with a GED who taught herself how to teach her own children. Her oldest is now in college and has a 3.3 GPA. Her next child is a HS senior and can do trig and calculus like it's no one's business. Her youngest two are as sharp as tacks and both want to become scientists.
It doesn't take an education degree to teach children successfully. You have to really care about your young charges. In that, parents have a huge edge over politicians and educrats.