Then in the next sentence I said I was joking and that we will never agree what SD is.
What is self-defense? How do you train for it?
What really makes no sense is your comment about service people especially the USMC since my father trained and was part of the USMC Master Drill Instructor tought Judo and Karate to them, he spent thirty eight years in the service and I do not remember them using sport as a form of SD but what do I know being such a person who never ever had any real SD tought to me.
A couple things here.
Judo utilizes sport methodology in order to teach its skills, so your father's background backs up what I'm saying. Further, a hand to hand combat instructor like your father would be one of those few who do actually understand hand to hand combat. Even today, most members of the USMC do not spend a great deal of time on unarmed combat, and what they do train in is heavily based in Muay Thai and Brazilian jujutsu, and trained via sport methodology.
Just because someone is a Marine, does not make them a hand to hand combat expert. MCMAP and programs like it cover very basic areas of unarmed combatives, and those serious about training in it undergo extensive crosstraining in other systems.
So I guess the Olympic TKD programs for the Army Marines and Air Force help teach SD principle WOW, that is goon to know since I teach sport TKD as well. Now I am going to train my people to keep there hands down and do nothing except roundhouses and backswings for the sake of SD principles.
You're still stuck in the world of the one dimensional fighter. A boxer is only a boxer. A TKDin is only a TKDin. I would hope anyone training for self-defense has long abandoned this view, and those teaching self-defense realize that they cannot limit themselves to one system.
No art, Taekwondo or otherwise, contains all of the necessities needed to address comprehensive self-defense. Some people will always be better at striking, some people will always be better at grappling, but you have to be able to do them all to a certain degree when it comes to self-defense.
You do not have to be a Judoka to be able to defend yourself with clinchwork and throws, but if you are not training clinchwork & throws in a manner similar to a Judoka, then you're not going to be as successful. The same goes for your striking.
Weapons work also needs to come into that equation.