I'm not sure how apropos this is, but I've noted that the phrase "show up at their doorstep with guns" and closely related phrases are the cue for normal people who are listening to the Libertarian Schtick at a party or something to disengage and go get a drink or something.
Or you didn't read what you are responding to (totalitarian jlgreco).
Not to mention you must be unfamiliar with news of just that happening in Germany.
Perhaps we shouldn't allow YOU to vote, as proposed in this discussion for those who are supposedly seen as having poor critical thinking skills.
And we shouldn't allow you to teach your kids either, nor to have the option to send them to the school of your choice. All under the logic of this discussion. Enjoy.
Laws don't live in a vacuum. They are enforced with the threat or carrying-out of violence by those with a monopoly on force.
Suggesting that someone's children be taken from them is absolutely the threat of showing up at their doorstep with guns. Do you think people just say "no, it's no big deal, take my kids that I love."? Not a chance.
I'm not sure if you're being a dick or if you haven't thought this through (or both).
Regardless of which political movement you or anyone else associates that phrase with, that is essentially what anti-homeschooling proponents are advocating.
It's way less persuasive than you think it is.