You may as well ban every technological advancement in society then. There are risks to everything we do, build and support. Ban 'em all! Let's go back to the dark ages where everything is safe!
Needless to say, I don't feel compelled to take a moral or ethical stance on the use of such tools -- in this case; pocket knives and their inherent dangers.
Every time no matter how sophisticated or the no. of safeguards you put in place, can still inherently pose risks.
I'm not even arguing about food safety. Just think about the many restaurants that prepare and cook up the Japanese pufferfish. That's not even a tool problem right there, that's a skill and trianing problem. That shit™ will can can kill you if not done right.