I agree also, it's good to be careful, not good to be scared all the time, because that does harm to your well being also. I was going to say just ask one of those who were in the ditches in Belgium/France during WW I but we can't anymore.
I'm not sure it could be called a "thing" when it is probably the majority of the male population, but I also ride bicycles without a helmet.
If you mean you ride more than one at the same time and without a helmet then 'Bye, it was nice knowing you'. (Can't give a smile here as that would seem uncaring).
i just turned 78 and started wearing my helmet while bicycling about one year ago. this after reading that one of the major life changes for the elderly is head injury!! prior to that i spent my entire life avoiding helmets. things change. perception changes as long as you accept the consequences (including the financial ones) ride on and enjoy!! everything you do in life has associated risks
Interesting find in a wide study of international data among OECD countries regarding Covid deaths: (full article here: https://www.medrxiv.org/content/10.1101/2020.07.23.20160895v5.full.pdf ) The study concentrates on the Infection Fatality Rate (IFR), as opposed to the Case Fatality Rate (CFR). CFR relates to the fatality rate among registered cases only (and is much higher); while IFR includes unregistered cases. Obviously death rates in non OECD countries may reach far higher because of lacking (access to) medical care.