Of course they have the use the excuse that the ban wasn't good enough, to try to pass even stricter bans, such as outlawing ALL guns.
What else would you expect from gungrabbers?
Here is a relevant article:
Police turn to judges over rising knife use
http://www.canoe.ca/NewsStand/LondonFreePress/News/2005/04/22/1007789-sun.html
The number of weapons offences involving knives in the city has spiked, prompting city police to prepare reports for Crown attorneys on the skyrocketing statistics. Police hope the reports, which will be provided when someone convicted of a weapon offence is sentenced, will show judges that the use of knives is a dangerous trend in London.
In 2003, London police investigated 165 offences involving knives, compared to 190 in 2004 and 63 in the first three months of this year -- a 50 per cent increase compared to the same time period in 2004.
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As we keep saying, it's not the guns, it's the people.