Laws like this lead to the regurgitation of distinctions that are more artificial than real. The good ol' Swiss Army Knife is in the same boat as an "evil" dagger. A SAK can be a highly effective weapon, and not just the blade. The corkscrew on a SAK may be a preferable weapon sometimes, and is something regular knifes don't have. I guess Canada had better start banning cork screws too!

A dagger may be used effectively to do the same things for which I use my regular folder. In fact, if I needed to punch my way into many boxes for whatever reason, I'd prefer a dagger over a regular folder. A person shouldn't have to get special permission (license) from big daddy government just to carry a dagger.