I concur.
Amnesties in most cases inviolve law abiding citizens surrendering weapons they were never going to use. The argument is though, that if they are out of circulation, this can only be a good thing.
Furthermore, you raise another interesting point. I dunno if you have read the British Crime Survey, but an interesting point is that there are two issues - crime, and the fear of crime.
Politicians will always try and stir up fear for their own ends.
[Or have I missed the mark slightly with this comment???]