There are two sorts of safety. Primary safety avoids or reduces injury, secondary safety assists survival of the injury.
I suggest aiming for condition number one and dress for condition number two.
An aspect of helmet safety that is unknown to many: a helmet is a one shot device, and once it has been in a violent impact which would have caused/did cause a notifiable head injury (including concussion), it should be scrapped and replaced. I always did this with my motorcycle race helmets, much to the bafflement of my co workers when I did it after a race weekend.