That's exactly why thousands of police departments, the Marine Corps, Navy Seals, and many other agencies in the world spend millions of dollars to develope MA programs
Now if you're talking about kids Karate classes... well that's geared more toward developing athleticism and self respect, but with SD aspects mixed in. I wouldn't call it a "real world" martial art though. Brazillion Ju-jitso, among others, are very useful "real world" martial arts.