In the US, possession of a switchblade is a federal offense, but butterfly knives are as legal as rye bread.
In Germany, it’s just the opposite. About switchblades and butterfly knives, I mean— bread’s not illegal there, as far as I know.
Funny thing: neither place, far as I can tell, suffers from crime waves using either instrument.
I am sure someone smarter than me could figure out some sort of meaning in this.