Most modern passenger car passenger cells don't need roll cages because their passenger safety cells are properly engineered, and because crash safety is much more comprehensive, with wheels and suspension components designed to intentionally fail and crumple in a crash so they aren't pushed into the passenger cell.
A ton of cars pass Euro-NCAP and IIHS crash and rollover tests with flying colors.
Obviously not every car is up to snuff, especially at the bottom end of the market. You couldn't pay me to drive a current production GM, Ford, Suzuki, Mitsubishi, etc compact sedan.
5-point harnesses aren't really that necessary at 0-60mph speeds in a vehicle with modern airbags; the fifth strap is mostly for anti-submarining but a number of manufacturers have produced seats that are anti-submarining and anti-submarining dashboard design (both material and shape) is a thing as well.
All of it's possible, it's just a lot of car companies are cheap and consumers don't really shop based on stuff like "is there an anti-submarining design to the dash."
A well-built roll cage should prevent the very issue that is under discussion here (it should shove the truck up or the car down, not decapitate the driver).
A ton of cars pass Euro-NCAP and IIHS crash and rollover tests with flying colors.
Roll cages were a Thing because, well, this:
https://www.youtube.com/watch?v=fPF4fBGNK0U
Obviously not every car is up to snuff, especially at the bottom end of the market. You couldn't pay me to drive a current production GM, Ford, Suzuki, Mitsubishi, etc compact sedan.
5-point harnesses aren't really that necessary at 0-60mph speeds in a vehicle with modern airbags; the fifth strap is mostly for anti-submarining but a number of manufacturers have produced seats that are anti-submarining and anti-submarining dashboard design (both material and shape) is a thing as well.
All of it's possible, it's just a lot of car companies are cheap and consumers don't really shop based on stuff like "is there an anti-submarining design to the dash."