There are a couple of good articles on BBC News about the amnesty
here and
here.
Summarising the articles:
(a) The amnesty is mostly symbolic,
(b) Knives are easily replaced, so the amnesty as a mechanism won't really achieve much in the way of getting knives off the street
(c) It's mostly teenage boys that carry,
(d) It's mostly a peer-pressure "cool" thing not a "I must go and stab something" mentality
(e) The law needs tightening to make it more difficult for under-18s to buy knives and to increase the penalty for those carrying them as weapons, and
(f) Education is important.
In my mind it's clear as to what the amnesty is aiming at. I haven't read the Sun or Daily Mail so I don't know what their slant on things are, but the BBC at least do seem to be talking about "knife crime" rather than just "evil knives" in general. So as I said before, us Bushcrafters have no problems.