"Gotta watch out for those violent knives. They are first cousins to those guns that go on rampages."
I'm not very good at punctuation , nor proof reading, but until the PC thing took hold, everybody has always known Mexico is a knife culture.
Talk to a guy over say 60 and ask him, has anyone thought of Mexico as a knife culture.
Whenever we hear of trouble in Mexico, it's cram full of guns. Nobody cares about the knives anymore.