I grew up in a state where the helmet law was lifted before I became old enough to even get a driver’s license (Florida), and when I moved away from there, I came to a state (Pennsylvania) also with no helmet law. Well, there is one, but it’s weird:
If you only have a motorcycle learner’s permit, or have had your Class M license for less than a year, then you are required to wear a helmet. If your bike only has liability insurance (bare minimum legally), you are required to wear a helmet. Otherwise, no legal requirement.
I don’t believe in seatbelt laws because when you choose not to wear a seatbelt the only person you’re endangering is yourself. Helmets are a different story. While riding I have been hit by debris that hit my helmet hard enough to make a very loud sound. If I wear not wearing a helmet, that debris would have hit my head and it likely would have hurt a lot and I would have lost control of the bike. For that reason and that reason alone I do believe in helmet laws, despite never having lived in a state that had one.