Banning guns is philosophically unsound, for the exact reasons this guy just listed. Look at Britian where they are now having unprecedented amounts of stabbings and are actually confiscating things like pliers and forks.
I'm uncertain about this idea that increase in knife crime means gun control is pointless. I'd much rather get stabbed than shot given the differential in mortality. Even if all gun crimes were replaced with knife crimes the per capita homicide will be lower.
Look at Chicago for an example: It's one of the most restrictive states in the union on 'gun control' yet has some of the highest murder rates and death by guns across the board.