I am not saying FMJ is "ineffective" by any means. There's just a chance of the projectile passing through the body cleanly (a sure shot is not always possible) and that if it does it hits some kid across the hall/street etc...
That’s why IMO Hornady's 9MM 135 gr FlexLock Critical DUTY gives you the best of both worlds in that the HP is filled rendering any potential "clogging" of the bullet's nose with any kind of matter no longer a concern. Yet you still get the FMJ penetration absent the fear of over penetration.
I get what you are saying so I guess if I lived on a farm or wherever collateral damage was not a concern I would feel just fine using old fashion ball ammo.
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