Because we've been told for so long that any other option, or especially taking into our own hands, is a disaster and our kids will 'fall behind.'
And yet kids have never had more access to knowledge, information and quality learning resources outside of school, without the toxic social environment. Say you'll do it yourself thanks and people call you a child abuser - while their kids are bullied and 'underperforming' at school with teachers they don't like. It's insane.