1. Just another product of the educational system for the past 20-30 years. Many Elementary and Middle School teachers major in "education" which means they learn methods of education. It doesn't mean they have the "knowledge" to teach math, science, history, etc.
2. Does certification guarantee anything? Many elite private and boarding schools don't have state-licensed teachers, years ago, many nuns teaching in Catholic Schools didn't have college educations and we turned out fine.