One interesting point of this debate is the diversity of choice, some prefer the basic bushcraft knife ( mora, woodlore, etc), and others prefer the larger, or more use defined blade, the fact there are so many different designs of blade prove just how essential they are in everyday life.
Each of us will eventually find the knife that suits our need, whether its a simple fruit knife or a large serrated blade knife, and I dont personally think that the choice of knife design determines the mindset of the person, more to the purpose of use of the knife itself, so simply banning a particular style or design of knife doesn't in my opinion prove anything, obviously if all knives where banned there would be less stabbings, etc, but only less by knives, the murder rate or killings wouldn't go down. yes the knife is easy to carry and easy to conceal, but so are screwdrivers, knitting needles, bike spokes, banning one type of implement just moves the problem onto something else, if everyone carried a knife I doubt the number of killings and stabbings would go up, as the miscreants who use the knives as weapons use them in the knowledge that the victims are in most cases unarmed.
I dont know how many people are killed by knives in the UK each year, but I do know most stabbings are usually carried out in domestic scenarios, anyone who has lived with my missus for 50 years can well understand why,