Now don't get me wrong, know the benefits of helmets And if I ride in or near traffic I will wear one. But just to play a devils advocate here...how many of you rode bikes for umpteem number of years without? I know when I was a kid, a helmet? Huh?? What are you talking about. Had plenty of skinned knees from wiping out on gravel roads...yep...before they paved our roads...LOL.
Basically people will wear them or not. If its not hte law then there is no requirement. I myself will likely invest in one just because I've already seen the crazy drivers

both vehicle and cart down there and I assume riding on sidewalk is a no no.
Used to bike around the bicycle capital (shout out to sparta, wi) and would ride on the sidewalks on the busy streets, other streets I felt fine doing it. But people were heavily aware of bicyclists and weren't out to run them off the road either.