Deaths by billion vehicle miles in UK - 5.2. In US - 12.5. (both have tens of thousands of KSI, but the US has over twice as many per cap. In fact, way, more KSI from car accidents than even gun related homicide in the US. I hadn't realized that!)
Deaths by gun related homicide in UK - 200. In US - 20000. (Both numbers pale in comparison to motor vehicle deaths, but there are a lot more in the US. Probably to be expected as there is stringent firearm control in the UK.)
Deaths by drug overdose and poisoning in UK - ~5000. In US - um, yeah, well over 120000 if you count the poisonings too as the UK does. (I'll just say, I think we found one of our major culprits in this one.)
I'm thinking overdoses is a major contributor. It's the only way to get to millions in less than 10 years. Car accidents, maybe, but honestly it's not that much compared to the number of young people who die every year. Ditto, with gun related homicide, which is even less than car accidents.
I know we may not want to talk about it, but I also noticed major numbers in suicides among young people. (More than vehicle accidents and gun related homicides combined in 2021.) Not sure if that's where the parent comment was going though? So I left that out. It could be a contributor though? The numbers are there, which is what you need to impact averages.
My takeaway? Suicides and drug overdoses. Not to be taken lightly.