Back when we lived on the farm we would kill a hog with a .22lr. A shot to the back of the head would drop them right where they stood. The front of the skull is about an inch thick, but the back part is no thicker than a humans. That being said, I have killed wild hogs with my .357 at twenty yards from a tree stand and they have always dropped within a few yards of where they were shot. That armor plate is tough, but if you use non-expanding slugs you should be able to shoot right through it at pistol range.
We have nothing to fear, but politicians.