Difference between Self-Defense and Sports Jiu-Jitsu

Do you train Jiu-jitsu for Self Defence? Or are you training for sport and don't care about fighting? The debate of Jiu-Jitsu for real life fighting being superior, compared to Training BJJ for modern athletes being impractical. JT & Joey unpack the difference between " McDojo" level nonsense and real military training for being harder to kill. 
The other element is the evolution of modern Sports BJJ and that it is far more practical for real life fighting than it was 20 years ago. The rise of submission grappling, wrestling and focus on finishing has changed how practical sport BJJ is for a real combat situation. The question of what training is more effective if you are attacked gets thoroughly discussed, but which side are you on?