As a parent, I agree with you 100% and this is a big problem in the US because quality of teaching has gone down drastically over the past twenty years. I think teaching in public schools should be a mandatory public service (or highly incentivized ie loan forgiveness) for college graduates.

Having a bachelors doesn't make someone a good teacher. There is a reason teachers get teaching degrees.

Having a teaching degree doesn't make someone a good teacher. In fact, one of the most common criticisms of the U.S. public schools is the education degree which is one of the least rigorous degrees one can get, hence attracts people of low aptitude to the field.

Actually, there are student loan forgiveness programs in place for teachers for exactly this reason