And the fact is, apparently, there is nothing deficient about this particular round, or even this particular weapon, for mass slaughter of unarmed civilians.
Then why don't we have three million mass murderers?
Are you aware the 5.56 NATO round is a relatively feeble round if ones goal is to kill something as large as a human?
Are you aware most owners have the weapon for either home defense ... being that the round is designed to not ricochet and to severely maim a target instead of killing them ... or as a varmint gun a they will sent coyotes, opossums, wildcats, wild boars, wild dogs and the like to Allah with great haste?
Of course you aren't.