Some places don't. Some do. In Poland news about ban on knife carrying was April fool's joke. In UK it's a serious law with serious punishments. In UK people wh

Some places don't. Some do. In Poland news about ban on knife carrying was April fool's joke. In UK it's a serious law with serious punishments. In UK people who'd carry a knife with malicious intent just moved to carrying caustic chemicals. It's often not specific tech that's a problem, but the culture and incentives for its misuse. Although reasonable restrictions on all technologies aren't inherently bad. Restrictions imposed pre-emptively just because nightmare scenarios are easy to imagine and captivating are not great.