But of the places known to have a large share of cycling, none have mandatory helmet laws (at least as far as I know). Thus, it may not be sufficient but it seems necessary.
If most cyclists wear helmets, why do you need to mandate it?
If most cyclists wear helmets, why do you need to mandate it?
If most people refrain from stealing, why do we make theft illegal?
If most houses never burn down, why do we require smoke detectors?
2. Because it causes disproportionate harm to other people
3. I’m pretty sure that law isn’t universal and probably depends on city codes.. Regardless, if studies showed that requiring smoke detectors was burdensome enough to decrease the amount of new construction, to the point that it could be detrimental to society, then we should reevaluate that law.