If you ever put together a car from the 50's, 60's or 70's you would understand. They had very little structure and were weak. Most of those cars weighed a lot because of the steel frame the suspension and body were bolted to. The sheet metal was not going to absorb any impact, nor was the frame. New cars are much stronger due to their design, have safety zones where the passengers sit and many areas around it designed to absorb energy from another car, truck, tree and so on. New cars are leaps and bounds better than even cars made just 10-15 years ago. The designers and engineers coming up with new cars do a lot that the average joe knows nothing about and takes for granted. But we all should be thankful for their work.