James,
Martial arts can help if kept within specific context. Males typically have a problem called ‘hero complex’, or 'chase 'em, catch 'em, make ‘em pay’.
Males with martial arts training, unless they’re careful, can sometimes be worse off because they will not avoid situations they should, and will even enter into situations they’d already avoided out of some macho super-hero self-delusion.
The recent tragedy with kick-boxer Alex Gong highlights this.
If martial arts gives you better stress-management, better body-coordination, and if it helps you fight in the small window of situations you need to fight beyond survival instinct, then perhaps it can help (I think Strong is his excellent Strong on Defense book (thanks again Andrew!) puts its importance at about 10% in Self Defense.)
If martial arts fills your ego and gets you stabbed, shot or otherwise dead because you didn’t have real self-defense tools at your disposal, then…
Victor,
Fighting, IMHO, is just one component of self-defense, and people have to make sure they don’t just improve their fighting skill and ignore the rest and then think they have all the answers. Awareness, mind setting, role-playing, pre-planning, stress-conditioning, and all sorts of other factors need to be addressed.
And while many martial artists seem to think studying a cultural artifact like Karate, Wingchun, BJJ, etc. automatically makes them expert self-defense coaches, physical trainers, life-style gurus, spiritual advisors, nutritionists, etc. etc., unless they have specific training and expertise in each of those fields, IMHO they’re doing themselves and their students a disservice .