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It was even worse before the knife preemption law was passed. In some areas even a lock-blade was illegal.
Just as a crow-bar or baseball bat are deadly weapons with the right intent, so can be a knife. I happen to be a big fan of knives, straight razors, shuriken (aka throwing stars/spikes) and sharp objects in general. Once my ex -wife asked me to sharpen her tweezers, and she should have been more specific. I have great skill when it comes to making things sharp, and enjoy the craftsmanship of good steel. Much like how I generally carry a compact handgun because it's convenient, I tend to carry smaller blades (around 3.5"). That being said, sometimes I carry my full-sized pistol just because I can. It's rare, honestly, unless I'm going out on family land, but it's my right to do so either way. The fact that archaic laws exist regarding a simple piece of sharpened metal in this day and age is baffling. We all know that in either an offensive or defensive scenario, Rollin White ensured that blades, bats, hammers, or anything else was no longer the effective weapon of the day.

Jusme wrote: But right now, an over zealous LEO, and prosecutor, could potentially ruin someone's life if they have a machete in their vehicle, and can't convince them it was for a legitimate purpose.

I have a family member that has been refused many jobs because his criminal background check shows an "illegal weapon" conviction. He had a balisong (AKA butterfly knife) that his girlfriend at the time bought him in the arm-rest of his truck. It was over fifteen years ago, the knives have since been legalized, and his record still prevents him from plenty of high paying jobs for which he is otherwise qualified. It's ridiculous.