There is no need for a "beating". It is well documented that 9x19mm JHP ammunition performs better in the role of personal defense against humans than FMJ. I do not believe this can be disputed given the body of research into this topic.
Your ammunition choice is a personal one. You must be prepared to pay the consequences should you use the gun in self-defense regardless of ammo used. All you are doing is changing the odds of a favorable outcome; 9mm FMJ may be EXACTLY what was needed for that fight. Conversely, it could be the wrong ammo based upon the circumstances. You will not know until after the fight.
Your ammunition choice is a personal one. You must be prepared to pay the consequences should you use the gun in self-defense regardless of ammo used. All you are doing is changing the odds of a favorable outcome; 9mm FMJ may be EXACTLY what was needed for that fight. Conversely, it could be the wrong ammo based upon the circumstances. You will not know until after the fight.