The Victorians apparently had almost 25000 machetes between those put into their 45 bins and handed back from retailers, that's a lot for a tool you reckon nobody uses or buys. I seriously doubt that any major percentage of that came from the criminals - it was already illegal to carry machetes in shopping centres and have fights with them and they obviously didn't care about that so why would they hand any in just because that was also now illegal.
For the small chance you're not doing some sealioning bullshit with your questioning I've used mine to clear a considerable amount of lantana and crofton weed every time I head up to Grandad's property, as well as controlling a bunch of invasive running bamboo and clearing blackberry from single track runs. It's an effective and useful tool - I just don't make youtube videos of me using it so I guess it's not real in your world.
This sort of holier than thou attitude is definitely one reason why people aren't flocking to the Greens...