I didn't know that US cities "historically" against guns are the more crime ridden, but UK cities have dramatically lower crime levels all round.
You say that guns are most dangerous when the criminals have them, so you need them too. I say that the majority of US criminals get their guns the same (legal) way you do, and without so many guns on legal sale, nearly all criminals would be gun free. In the UK, guns are extremely rare among criminals, hence the windbag politicians going after knives. Unfortunately you can't turn around. If you abolished guns now, everyone would still have them.
You also misquote me as having never seen a gun. I have both seen and (I think I forgot to mention it) fired pellet guns and farm rifles. Admittedly I haven't fired a regular pistol, but the pellet guns were both pistol and rifle styles, both firing metal pellets. The pellet rifle belongs to my little brother, and some of the metal "pellets" he has are a pointed-tipped "piercing" kind. Which, to be honest, is a little scary in his hands.
This has been an interesting conversation, maybe I'll speak to you again some time :)