I’ve heard of people that turned ordinary kitchen knives into weapons. What will they think of next?
Old quote: "There are no dangerous weapons. There are only dangerous men."
It is not possible to turn the work into a safe playpen by banning ever-more items that criminals can turn into weapons. The only thing that works is keeping the criminals in jail, or killing them.
Did you hear about the person who used a stick to beat someone to death? Sticks definitely should be outlawed.