Because it EXPLODES inside the body and SHREDS the flesh.
Saw a comparison of what a regular handgun bullet does and what a bullet from the AR-15 does. It is not pretty.
Which absolute proves that they are all batsh** crazy loony tunes who want to maim torture infliect pain as much as possible.
The batsh** crazies are out there and growing in number. Sales of the AR-15 are growing in number. Any gun person with any honor owns as many of them as possible. It's a status symbol you know? The more own the better equipped you are to mass massacre "THE ENEMY".