Yet 53,000 people a year in the US suffer traumatic brain injuries from motor vehicle crashes.

If we are to believe a helmet will help a cyclist, it must be true that helmets would have helped those drivers and passengers too.

The airbag argument is just distracting. "Let's not use antivirus because we already have a firewall".

https://www.cdc.gov/mmwr/volumes/70/wr/mm7048a3.htm#T2_down