>You can also cut yourself with a kitchen knife but nobody proposes banning kitchen knives.
oh nice, i love this game.
you cant carry a kitchen knife that is too long, you cant carry your kitchen knife into a school, you cant brandish your kitchen knife at police, you cant let a small child run around with a kitchen knife...
literally most of what "the state" does is be a "nanny"
(not agreeing or disagreeing with google here, i have no horse in this particular race. but this little knife quip is silly when you think about it for more than 5 seconds)
I think it's important to consider the intent of those laws, too. They are primarily or even exclusively to prevent you from hurting others with knives. They are not really intended to protect you from cutting yourself in your own home. So I think the parent's comment still holds weight.
All of these rules, and yet people still cut themselves and others.
In this example we still don't require you to register with anyone to buy a knife, get the blessing of some institution to sell knives, or, as in this case, get a certification before you can start making knives.