I remember watching an excellent old documentary about Joey Dunlop, how he kept defying the odds coming back from injury and winning. If my memory is right, his last race he was a bit upset about death of his friend and not in good state of mind to be racing?
The word fearless is often overused but with these TT racers it's very apt. I get chills just watching the footage. I don't think these guys get enough credit.
An friend at uni used to race bikes, used to love telling me his catalogue of injuries!
I have dabbled in track racing on bikes in my younger years, including qualifying as an instructor. Road races are incredibly dangerous as mistakes or mechanical failures can so easily bring you down catastrophically. The top guys are amazingly skilled and must be pretty fearless. Not sure I would ever risk it with a young family at home.