Yep, I see both on my rides. I have also heard and read all the various comments and arguments on both sides. What is funny is how both sides can use the same basic data and reach such opposite conclusions.

My son and I both wear helmets, we just have always worn a helmet. In Portland, kids under (forget the age now) are required to wear helmets. For my son, it was more than about the law, it was sharing that I had a high-speed, single bicycle crash once. This was back in the lycra covered, foam only helmet days. Hit the ground so hard I blacked out. The helmet was broken in to 3 pieces, but remained together because of the cover.

That convinced me that things happen fast and a helmet seemed like cheap insurance, because you just never know. This is our choice.

If others do, fine, if others don't, fine. We all, as others have said, have to make our own choices.

PS: I have hit the helmet 3 times so I will keep wearing one. I should note, that testing up and down the street I will go helmetless, but anything else, I strap it on.