No one is shooting mil-spec, Gen(x) ammo. They are buying the cheapest, or most local crap they can find in their local stores.

I'd argue that this off-the-shelf ammo yaws like a MoFo, and if you were to believe what is in this Wiki article about the round itself, are probably doing CONSIDERABLE damage to a human body shot at a close range.

https://en.wikipedia.org/wiki/5.56%C3%9745mm_NATO

Look at some of the survivors of the Las Vegas shooting - the 5.56 bullets ripped them apart and they were not hit in a vital area. Those boolits farked them up, caused SEVERE damage that was only survivable due to modern ER Medice and did not kill them.