Well where I am at I never see people ride motocycles with helmets.
It's very possible that Ohio doesn't have a law saying that motorcyclists need to wear a helmet.
I do feel that people under the age of 18 must wear a helmet whether they like it or not. They are still legally under everything of their parents (house, rules, insurance etc.) But Once you're 18 and over it is just clearly their choice.
Along with my helmet, I also wear a vest. I have seen many friends of mine fall off and be able to walk away because they were wearing a vest. As soon as I got Vega, that was one of the first things I got.
While they may not prevent all injuries, there is less risk if you wear the proper gear.