Not sure it is fair to call people dumb-dumbs when wearing a helmet hasn't been proven to save lives or protect from injury. Do you research and see if there is a clear case that helmets save lives. I suspect you are reacting more from propoganda than from research. This is why this issue is debated. Notice there is a lot of debate on whether brakes are a good idea.

Lots of pros and cons on this issue - if you get out of the USA - you will find most people don't wear helmets.

However, I suspect you should wear a helmet since you are more comfortable with the idea.