You might find this interesting:
http://www.fbi.gov/ucr/cius2006/data/table_04.html
Obviously, probably all of us on this forum have some level of concern for personal safety. That's at least part of the reason that most of us study martial arts. But my points are these: 1. the odds of actually being the victim of violent crime are very low, especially if you don't do drugs and avoid drunkeness in public. 2. the returns on your training investment greatly deminish beyond a certain threshold level, which is pretty low. All you can do is increase your percentage chance of survival through fitness and behavior control. Merely being in shape from weight lifting and cardio will greatly increase that percentage chance. Add in a REASONABLE level of martial arts training and that percentage increases more.
Even if you find yourself in a lightening strike rare situation even the best training in the world will not make up for luck/bad luck, common sense, instincts--things you can never train for. And, I submit to you that the all time "best" program is not going to yeild you a much better chance of survival than a reasonable martial arts and fitness program.
I've been careful to not define what is excessive and "reasonable." There's no certain point where a reasonable program turns excessive, but certainly training your life away to fight an ex-Navy SEAL turned criminal is a waste of time.