But there is a much better, much more foundational way to deal with the problem of government schools being the soft-targets of choice of soft-headed people:

Get your kids out of government schools. 

And not just because they are soft targets. Do it because government schools are the places where soft-headed people are created. Not just intellectually, either – although government "schools" do their best to stunt the development of critical thinking in favor of critical race theory and other orthodoxies that must be truckled to.

Government schools are emotional wastelands.

Instead of family and friends – people your kid knows and whom the kid knows cares about them – random strangers constantly changing, from classmates to the teachers – some of whom may care but not in the way a kid's actual parents do (or ought to). Your kid is one of the herd, herded along from class to class, among kids he may not really know and whom you, the parent, are even less likely to know much about, if anything. 

Who are the people teaching your kid? What are they teaching him? How do they treat your kid? In a government school, you have not-much right to know the details about these things and no right to do much, if anything, about them.

But there is one thing you can do to assure your kids are not made into soft heads by government schools – and not rendered soft targets at a government school.