Lets put them alongside steak knives so we aren't confused by them both being safety products but instead just products.
The test for steak knives being good is showing them cutting meat so if you want a lesser test(30mph down to 12mph) why not cut butter with it and call it adequate?
Good luck cutting your steak with a butter knife? Bicycle helmets with motor traffic?
If they aren't designed for impacts at any speed greater than 12mph just think of all the other dare I say better improper uses of them you could be using them for, I think the bmx style ones would make rather fetching hanging baskets for plants.
Lets put them alongside steak knives so we aren't confused by them both being safety products but instead just products.
The test for steak knives being good is showing them cutting meat so if you want a lesser test(30mph down to 12mph) why not cut butter with it and call it adequate?
Good luck cutting your steak with a butter knife? Bicycle helmets with motor traffic?