If you're MTB or going fast, sure wear a helmet. If you just bike to get to work or school and stay well below 25km/h, and have good cycling infra, you don't a helmet.
I don't wear a helmet skiing but always when biking. It's too easy to lose your front tire grip on gravel or wet pavement and that often puts your face in direct contact with the earth. It happens almost instantly.
If you're MTB or going fast, sure wear a helmet. If you just bike to get to work or school and stay well below 25km/h, and have good cycling infra, you don't a helmet.
It's like US don't want people to bike.