"Gravity knives" are banned too. Why? They are simply easier to open. As easy to open as flipper knives, which are legal. And you don't even have to open fixed blades - also legal.
Butterfly knives are harmless. It is literally easier to kill someone with a legal knife than a butterfly knife, because with a butterfly knife you're forced into a ridiculous opening animation. But it looks spooky, so banned. Pathetic.
You can't even own some of these items in your own house. Imagine not being able to buy a decorative shuriken or whatever. How many people have been killed to shurikens, again? But if you put one on your wall it's 4 years in prison.
More importantly, what criminals will even care to follow this law? Do you really think a criminal interested in stabbing another person will go "geez, well, I guess the law says I can't use this 3.5 inch locking knife!" Fuck no, worst case they'll grab a kitchen knife and get stabbin'.
Stop trying to justify this ridiculousness. The UK is a surveillance state clown show where things are banned for fun. More cameras per capita than China and you can't own a decent box cutter because some politician is trying to justify their worthless existence.
[1]: https://www.victorinox.com/us/en/Products/Swiss-Army-Knives/...
Imagine being sent to prison for 4 years and having your life literally ruined because you used this at a picnic. lol.