Are our Slants "Unsafe"?

A friend of my Fathers was hit head on while driving his 64 Imperial.I can not remember what the other car was,but all 5 people in the car were killed.My Fathers friend came out of it without a scratch.This happened in the early 70's and so he drove 64-66 Imperials only for the 30 years until he died in the 90's.