While that is true, in states with restrictive knife laws, there is no permitting, tax stamp, or background check option. They’re simply illegal typically without exception.
I.e., a CCW does not apply to an OTF knife or dagger in states where those types of knives are illegal, and there is no legal option available to legally carry one. Conversely, with sufficient paperwork, background check, and tax stamps, etc, you can get a machine gun.
I am just pointing out how odd it is that in some states there is a legal avenue for a citizen to purchase, own, and use a machine gun but not a small blade that opens with a button. But laws are often crazy, so, I guess it’s not really a huge surprise.