Knives are good for food preparation in the kitchen, camping, as a tool for the outdoor tasks, as a good jungle companion. And for OFFENCE. Any person embarking on a do or die mission in the armed forces, should be packing a knife capable of causing damage.
What a knife is not good for....is self defence.
1. Its practically useless in the untrained hand.
2. It is also useless in the hand of someone who isn't prepared to use it as an offensive weapon (its not self defence...its pure offence)
3. It will get the person wielding it, a long term in jail, irrespective of the situation.
4. It takes too long to deploy....imagine trying to get it out of your pocket, opening it, adrenaline pumping, getting snagged in clothes, critical hand immobilised...while someone is advancing on you.
5. It can cut you. Too much adrenaline does strange things to our motor movements
So, what works?
1. 2 Hands and 2 legs....very lethal weapons if trained
2. A simple pen
3. The top of your head, thumbs, fingers, elbows, teeth... in close quarter
4. Learning to sprint...if you can out run the average criminal you are safe
5. A long tool...like a spanner, walking stick
6. A short tool...screwdriver, torch, kubaton or any impact device
7. Finally....your ability to simply defuse a situation and walk away...charm, tact and style