Not a term used or at least I'm familiar with in the UK. I'm weapons trained (not firearms but in a martial arts sense). I've spent over 30 years in a confrontational environment/job and certainly wouldn't dream of using a knife for self defence, much better options even in the UK where there's strict no public firearms carry.
I buy the knife/knives I want regardless of any perception of their image.
I buy the knife/knives I want regardless of any perception of their image.