It comes down to that education plan. If it had been submitted and there was no reasonable dialogue, then the parents might have a gripe.
If anyone here knows the parents, I really do wish they'd start a thread.
That would be good. Until then we can only speculate as to their exact motivations.
I still think it is wrong for the government to have any say about whether parents educate their children or not, much less how they educate them.