If sparring/rolling is part of your daily diet, "self defense training" might not be necessary. If sparring/rolling isn't part of your diet, in my opinion, no amount of self defense training will prepare you to fight. Also, as has been said, fighting itself isn't the only part of self defense, crime prevention or what-have-you.
In order to actually know how to fight, you have to train fighting. Constantly.
In order to actually know how to fight, you have to train fighting. Constantly.