28. Niki Lauda
Lauda knew better than anybody about the risks of Formula 1 racing. The former Ferrari driver almost died after a fiery crash in Germany. He competed in the Fuji Grand Prix in 1976 a month after his return. But he refused to complete the race because of heavy rain (via The Guardian).
This race cost Lauda the championship but he shrugged because he said his life was more important. He left his teammates high and dry but it’s understandable after his traumatic experience. Most of the other drivers didn’t even want to race that day but they agreed to compete.