I too read that article yesterday. I found his "martial artists are motivated by fear" statement odd. It was my impression that he was addressing martial artists who shoot, which isn't really an apt generalization. I believe shooting is as much a martial art as anything being taught at the corner dojos/dojang/kwoons of Anytown, Anywhere. Some martial artists shoot with little passion or gusto, while others apply the same love and zeal for shooting that they do to martial art practice. But a martial artist is definitively a person who applies themselves to the practice of any martial (or combative) skill, including shooting, with more than just the desire to be merely competent. I've seen "Gamesmen" who were pretty lackadaisical about developing their skills. I think it boils down to these two approaches to any martial skillset.
For example, certain shooting forum posters write about "combat accuracy", as in "who cares what (this or that) pistol groups at fifty yards, it's got adequate "combat accuracy", which to me usually denotes an inability to hit an 8" plate at more than the seven yards that "most armed encounters take place at." As Filishooter said, certain people (who I personally don't feel should be properly labeled as "martial artists" or anything else) establish systems and methodologies that can limit their standards and expectations. Pure sport shooters don't impose such limitations on themselves, pursuing only clearly definable improvement.
Duane presented an interesting perspective and I agree that the best way to maximize one's potential is by freeing oneself from any arbitrary set of rules or limitations in the pursuit of your goals, and to never say "good enough."
P.S. I in no way intend to denigrate the multitude of very worthy shooters who don't pursue shooting with the nearly obsessive joy that I and others do. Anyone who achieves competence in shooting is a boon to society.