In all honesty I find home schooling very precious and weird, unless there are genuine medical (severe epilepsy etc) reasons why school isn't possible. Unless there's no other option, I also find it very arrogant that someone thinks that pushing a baby out their fanjo somehow makes them a qualified teacher in all school subject areas.
I would assume the parents were either hyper religious, there was abuse going on (mainly for the weird middle of nowhere families in the,USA though), or that one parent couldn't let go of their child and had latched onto any excuse not to send them to school.
I know one home schooled person who stopped going to school for no reason and his,parents,decided well okay, we won't force the,sweetheart he knows best. He did study, but then decided not to bother taking his gcse exams for whatever reason. I think when people let their child get their own way on major issues it becomes very difficult to pull back from that.
you asked for our views!
in your situation I think pulling him out of school entirely is far too extreme. Could you speak to the school about getting him a few weeks signed off leave, and explaining to him that people need to go to school, but you are going to give him some time off to focus on his feelings. However, its not an indefinite get out clause, as school is very important.
could you perhaps have a,separate meeting with the,school to,see,if there are any other issues? His reaction sounds too extreme - could there be bulling involved? Maybe this could be something,for him to,discuss with,a,counselor.
he can't learn,that simply giving up and running,away is how to deal with problems.