Kevin,
I don't think that's the main reason at all why parents choose to homeschool. Yes, there are school shootings, but not near enough statistically to worry about it. Instead, I think there are 2 main reasons: 1) kids are trouble makers and parents basically declare 'homeschooling' instead of just letting the kid be a proper dropout. And #2) parents who want their children taught both properly and without the liberal bias. I'm not sure which group is bigger, but between them they dominate the 'reasons' list.
BTW, I have no idea how you can stop people from easy access to napalm. Styrofoam and gasoline, mix carefully. Does a wonderful job for the purpose intended (imbedded flaming incineration). It has it's place: it's a great way to get a stubborn burn pile going. And I suspect it'd work great on a cluster of Antifa morons (no loss there).
Yes, you can make napalm from detergent and gasoline, or--as you indicated--from styrofoam and gasoline.
I can also make a gun from scratch with access to a machine shop.....or even from simple home tools.
This doesn't mean that I think flame throwers should be available to any psycho maniac who wants one.
We have rules to keep firearms out of crazy peoples' hands.....but a flame thrower? No problem!
As for home schooling, the parents I've spoken with are concerned about gun violence in schools, the ready availability of almost any drug you want, sexual assault by both students and faculty, and so on.
I don't approve of home schooling in principle for a few reasons:
1) We go to professionals (like a physician) if we have a health problem, or a professional (like an attorney) if we have a legal problem.....and I believe that education is so important that it must be handled by a professional.
2) Parents are not impartial, and may have unrealistic expectations of their children.
3) It's important for kids to associate with other kids to learn about being a team player.
4) If there is abuse in the home, teachers are an important first responder who can recognize this and get the ball rolling.
5) There is a difference between education and brainwashing, and this distinction is sometimes lost on some parents.
I believe that objectivity is important in education.
That having been said, I want to reiterate that the drugs, guns, gangs, and pedophile faculty that exist in many public schools (I'm in Florida, and schools are truly awful down here) would make home schooling look very, very good to me indeed....especially if I couldn't afford a private school.