maybe the 100% rate is true, but not 100% career-ending injuries.
Most people quit playing a given sport seriously because they have to choose between that and making money.
I swam for 4 years in college and I only know 1 person who had a career ending shoulder injury, and that one because it was misdiagnosed for a year.
OTOH everyone I know who played football at any level has at least a minor nagging injury.