A number of stories on the front page of the BBC (UK) in the last week have been about the issues of the rise Knife violence. The band guns, and now there is an increase of murders via a knife. Bad people do not follow the law.
https://en.wikipedia.org/wiki/Firearms_regulation_in_the_Uni...
They have not always had the outright ban they have now.
Knife Crime:
https://www.bbc.com/news/uk-42749089
With the number of fatal stabbings in England and Wales in 2017-18 the highest since records began - the BBC has tracked the first 100 killings in 2019 - revealing the people behind the headlines. - Mar 8, 2019
"there were 285 knife murders in England and Wales in 2017/18 — the highest number since the Second World War — and 34 in Scotland"
Not everything is black and white.