^The other thing to remember is that the number of children abducted by strangers hasn't changed between now and the 1960s.
So all our precautions, trying to protect children from abduction etc... has actually made no difference whatsoever. If it doesn't make a difference, why doing it??^
I agree on keeping risks in proportion, and I was told that statistic at college, too. But here's the thing: car ownership was rare in the 1960s, compared to now. Population mobility was far lower, and the population was smaller too - which actually indicates proportionately fewer kids were killed. We're also a far more violent society in general, to judge from crime figures. You can argue that the abduction and murder of children not having increased indicates the risk hasn't increased, or you can argue that greater vigilence by parents has decreased opportunity, and thus kept the figures static despite other factors which would have led to increase, otherwise. More simply: if you wanted to abduct a kid now, you'd be far more able to do so, if kids still wandered around in the free range way they used to. They don't, so abducting one, especially a young one, is going to be far harder for a predator than it was back in the day.
Again, I appreciate that we put our children at far greater risk every time we strap them into a car seat. I also think that cooping kids up in homes, and not allowing them opportunities to roam, explore, have adventures and build independence has troubling costs of its own - healthwise, in terms of activity levels, and in terms of independence, confidence and ability to manage risk sensibly. I'm not saying I think our modern attitudes are necessarily good ones. But I don't think the way that stat above - on abduction/murder rates not having increased - proves what you think it does. Far fewer kids are killed by cars as pedestrians now than were in the 1970s, despite far more cars on the roads... yet we accompany them everywhere, and kids no longer play out on the streets. Which is likely to be more to do with it than the road safety message having been absorbed more by current generations. It's not safe to look at a stat without examining surrounding factors.