The best Western gunfighters tended to advise that the secret to winning a gunfight is to not get rattled but take your time to aim and shoot accurately. For some, such “coolness under fire” is instinctive, while for most it takes training and discipline to acquire. Psychologists also point to the strong moral prohibition against murder as inhibiting most people from instinctively having the necessary desire and readiness to kill in a gunfight.
The best western gunfighters shot from behind, or shot when someone wasn’t expecting a fight. The gunfight near the OK corral was fought at very close range, and it is likely the Earps drew first - which is always an advantage. That, and many of the shots taken missed.