It's not that straightforward to simply home educate though, is it.
Firstly, both parents need to be on board.
Secondly, one parent cannot work (or can only work VERY part time / flexibly).
Thirdly, it costs more than school so it's not affordable for all: groups, activities, food etc. Children's at school get free lunch for first three years.
Fourth, unless you happen to have other home edders near you, you need to be able to drive or have good public transport in order to meet up. Which again costs money.
Fifth, lots of parents don't feel willing or able to home educate for many other reasons.
While I applaud home edders for following their own path, it really isn't as simple as "well just home educate if you don't like school" for many families.
What we really need is an overhaul of the education system - and perhaps society as a whole.