I can now walk confidently at night knowing I'm safe from Ninjas

You're probably safe from most law abiding people, tautologically.

If anything, the most dangerous people, statistically, are those closest to you, rather than, say, random street ninjas.

They have one and only one use, are easily consealed, and very effective.

I operate a laser cutter and am not infrequently asked to cut knuckles and always politely refuse with a brief explanation why.

I was born and raised in a place where getting a gun was as simple as putting together $100 or so and walking down to the corner. Not the corner store, mind you. In that context, any ban on melee weapons feels silly to me. But yeah, knuckledusters can really ruin your evening/face.

However, having grown up in an environment where carrying weapons is generally banned, it seems equally silly to me that people with short fuses might have them at hand.

It's one of those things I chalk up to personal values. I can understand the opposite rationale, but prefer the Canadian way.