>...by not doing a offset test or picking literally anything but a GM X-frame car (notoriously bad at overlap crashed, even by 1950s standards)
So you are mad that they used a street legal car of the day to show that things have improved?
A fun historical fact I just discovered, "Ford offered seat belts as an option in 1955. These were not popular, with only 2% of Ford buyers choosing to pay for seatbelts in 1956" [0]. Which reads to me that many 1959 drivers would have been unlikely to have or use a seatbelt.