Great post, Brian. The 1955 Le Mans disaster also occurred against the backdrop of fierce nationalism. The German national anthem was not played prior to the race, and cars were painted colors based on the country of the manufacturer. The car of Pierre Levegh, who was killed in the crash, went into the crowd and officially 83 people were killed in the worst racing accident of all-time. Levegh's car disintegrated and caught fire upon entering the crowd. The dislodged engine, hood and front end assembly acted as a guillotine and decapitated over a dozen spectators. The disaster was made even worse when track workers doused the magnesium fueled inferno with water.
It has long been speculated that even more than 83 spectators actually died in the Le Mans Disaster.
As Brian mentioned, Mercedes was leading the race when team bosses elected to withdraw from the race several hours after the incident. Race organizers and Mercedes officials were keenly aware of the optics of a German manufacturer winning such a major race after a German car went into the stands and killed dozens of Frenchmen just a decade after World War II.
Who exactly was most at fault for the Le Mans Disaster has been debated for decades, and multiple books have been written on the topic. It is generally acknowledged that the Mercedes Levegh was driving was more car than he was able to handle, but perhaps Levegh was simply put in an impossible position in a split second. Eventual winner Mike Hawthorn usually receives much of the blame for causing the accident by abruptly darting into the pits, and Hawthorn allegedly acknowledged his role in causing the worst crash in racing history shortly after the incident occurred.
Famed racer Stirling Moss has said in the past that the problem with Le Mans at the time was that there were 120 drivers, 20 of whom were the best in the world. "The rest were idiots," said Moss of the amateur/sportsman drivers who were sprinkled throughout the field at Le Mans.
The race continued to its conclusion, at least in part because officials were concerned that the large crowd leaving the track all at once would clog up the roadways for ambulances trying to take the 100+ critically injured fans to hospitals. No announcement was ever made that anything out of the ordinary had occurred, and many fans elsewhere on the speedway grounds did not have any idea what had happened until after the race was over (several days later in some cases)
https://www.youtube.com/watch?v=JEk85gKJN6k
https://www.youtube.com/watch?v=rz2VezfEWXQ
http://jalopnik.com/just-how-horrify...rts-1589382023 (this is an amazing article on the Le Mans Disaster)