The entire point is that you can make a DIRECT correlation between the results of injuries from and effectiveness of a prison KNIFE fight involving a 3-4 inch sized blade to what a 3-4 inch GeeWhiz folder will do on the street. I'm also saying that a bigger, heavier, longer bladed weapon is MORE effective than a smaller one. A 3 inch blade can only cut three inches deep PERIOD. An 8 inch blade can do better. How much "useable" blade isn't as important as how deeply it is capable of cutting. Most of the deadly shanks are actually ice pick types that are intended to puncture deeply into the lungs, heart, etc..... I've seen VERY sharp knives that had 6-8 inches of VERY sharp blade but really, a 8 inch blade that is only sharpened on the first three inches is much more effective than a three inch blade that is sharp on its entire length.
THIS in turn is all meant to enforce the idea that a 2-3 inch bladed knife is NOT as effective a close range weapon as some (mostly those SELLING the knives and the classes to use them" would have you believe. It is also a challenge to the idea that in very close range, these very small knives are MORE effective than a firearm at that same range. This does NOT disqualify the idea that blades, even small ones, CAN be deadly. Any other conclusions to what I've posted belong to you guys, not me.