I think your comments are more suited to teachers of adult students, not pupils (i.e. younger children).
In my experience, as a pupil and student all over the world, I find very very few teachers who are competent. A huge problem in the countries that I have lived is that teaching is the catch-all default career for anyone that can't do anything else ("those who can, do; those who can't, teach").
On top of that, far too many parents seem to take far too little care in their children's lives in general and their education in particular, seeing their offspring as a burden.
For those of you who are interested, I found this book (Imagining Numbers (Particularly the Square Root of Minus Fifteen) a very interesting read, especially for those who ask questions like "why does the complex plane start 90 degrees clockwise?). It's meant for people with only basic numeracy skills, though there is added detail in the endnotes that might pose some problems.
When I tutored my step-daughter, back when she was still doing mathematics before she opted out in GCSE, I noticed that she was calculating the correct answer every time, then changing it (I presume this was due to a critical lack of confidence owing to the fact that everyone knew "girls were no good at maths"). It still makes me angry.