I'd grabbed some stats from several sites, but Headcasecompany.com was where I found that one - it's a grass-roots organization. I found some good stats from other sources just now, though- LINK LINK (Can't believe I linked Fox News.)
I couldn't find applicable stats for a wide range of ages for car accidents, which is why the info is different.
The short version is that saying things like, "I played and I am fine" are dangerous at best. When we know better, we do better - would anyone think of transporting a baby without a car seat these days? No. But there are people who say, "We didn't have car seats back in my day, and I'm just fine." Yeah, that's because the people who weren't fine aren't here to say so. We can improve this situation, and should. A little extra padding isn't sufficient with injuries on the rise.
Yes but we also need to keep digging deeper. We are a very reactive society including things like your example of car seats. There are studies that show rear facing car seats may cause more infant fatalities than they prevent (vs. Forward facing) because of babies left in the vehicles yet it is law of the land and now a big industry. We are collectively horrible at assessing risk. Two years ago on a similar thread I believe I was right there with you crusading against youth football. But the deeper I dug I realized it wasn't actually as concrete as I believed.