I am from the UK where guns are banned. And to be honest I always thought the idea that gun ban would solve gun crime is nonsense.
Criminals would get guns from he black market regardless, leaving normal civilians with no protection for it. People here often use USA gun crime rates as an example of what lifting the gun ban in the UK can do. What these people not realise that USA is a different country, Switzerland has a high gun ownership relative to the UK.
UK murder rate is high compared to many US cities, and I believe this might be why.