Funny, when I was a kid, my sister and I would ride around in the back of my moms 67 Austin Healy (no seat belts, factory). Or my dad had a 71 VW BUS, and while it came with seat belts I can't ever remember digging them out from under the seat to wear them. Most of the fun was moving around inside that car.
It as become so ingrained in me growing up around cars with out belts, that my wife still reminds me to put one one when we get into our newer cars.
As far as safety goes now a days, yes I purchase the top notch car seats, for my kids, and they ride in them as long as possible weight/height wise, because it is safer. Once they have outgrown them though, they have all got in a 60's Camaro, Mustang, with a lap belt only. I also plan to run lap belts in my 56 Chevy for them.
So yes Larry I am with you.
Maybe someone will call Child protective services on us, for driving them around in a older (unsafe) car, but I think they are fine.
Could it be this "rough" upbringing rub off on them and they may want to drive a classic when they get older???
I can only hope they are picking me up from the old folks home one day in a Classic daily driver...