Helmets don’t matter much when you are hit by a bigger vehicle.
Don’t tell that to the bicyclists.
I wear a helmet pretty much any time I am on two wheels. But I also understand that in a lot of circumstances it is just decoration.
I’m not a motorcyclist so I don’t want to comment here, but my cycling helmet (yeah yeah TTSTTTF) has saved my ass repeatedly over the years. Cyclists, especially crit/competitive hit the deck a lot (relatively). Not sure about motos…but whether it by cycling, snowboarding, or skateboarding I’m wearing (and insisting on my kids wearing helmets).
In 20 years of training I have hit the deck once. I ride in the country, my most feared and likely accident here is getting hit from behind by a car that never saw me. Helmet isn’t helping much there. So i wear hi-vis yellow and use bright lights to the rear.
I’ve tried riding the motorcycle sans helmet, it feels really stupid. Used to ride to work all the time and would go to lunch without a helmet, then saw a video of a crash test dummy t-boning a car at 30, it led with its chin.
But I still don’t count on the helmet saving me.
But it might save your head. As for the rest of you there are armored jackets, armored jeans/trousers, chest protectors, neck braces, etc. etc. None is guaranteed, but you’re guaranteed safer than the guy riding his motorcycle in shorts, t-shirt, sandals and no helmet.
Also, wear a full face helmet. 42% of motorcycle injuries to the head are face planters. A friend of mine lost two front teeth and a broken nose with an open face helmet.