What countries have that? I’m curious. A knife can be as effective as a gun under the right circumstances.
If you are carrying inside the belt or using a concealed external holster you will likely not survive a surprise attack by a good knife handler. The old adage “don’t bring a knife to a gunfight” only makes sense if the gunner has a lot of distance and time between themselves and the knife handler. There are exceptions but they are rare and this guy is likely one of them.
I have been shot twice and I would take that again over being cut in a fight.
More so in many.