It's true that bikes feel safer and are capable of sustaining 3 figure speeds all day. Brakes, suspension and tyres have all been greatly improved in the last 30 years. Modern cars have crumple zones and air bags. But if you run into one or one hits you at 3 figure speeds the good brakes, suspension tyres and their crumple zones aren't going to do you much good. I tend to think those old slow bad handling bikes helped keep me alive when I was young and experimenting with the boundaries.