...I have lived within fifty miles (or closer) to London most of my life, and I've seen a street stabbing (Battersea 1970), a bloke brandishing a billhook (Whitstable 1975) and several situations where people brandished knives. But if they'd had guns.....
I've faced more knives, hammers and clubs than anybody else I know, and my NHS record (for a couple of decades) reads 'Injured whilst making arrest' over and over again. Mostly bruises and scratches.... the occasional cut. Now if guns were more freely available here, I would have needed a permit to carry one as well, and almost definitely would have needed to draw it on occasion.
I don't understand your winner/loser position. When a gun gets shot at someone, that's a loss-situation.