(Going to delete what I originally wrote because...just whatever.)
edit -- deleted
P.S. You may be under a different impression, but JLPT level N5 is not some impressive achievement. Maybe it's impressive for someone who's been studying the language for a couple of months, but if you're living your life in Japan, it's literally barely communicative.
I'm not saying that invalidates your opinions, but if your own Japanese speaking/comprehension level is barely that of an early grade-schooler, then maybe you're not the most qualified person to critique the entire Japanese educational system and throw blame at literally every Japanese person around you, but absolutely zero at yourself. (In past posts of yours, you've implied that Japanese people are ignorant while yourself demonstrating an inability to use even simple Japanese verb conjugations, so forgive me if I doubt that you're having enlightened conversations with anyone in Japanese about your son's education).
But hey, if your pedagogical knowledge is so superior to your son's teachers / your wife / literally every Japanese person in existence, then maybe you should just teach your child everything so he can be an enlightened genius like you.