If you poke anything enough times with a Pen Knife, it's going to kill it. Doesn't mean it's a good idea.
They say a 22 short in an elephant foot will kill it. Not gonna try!
I don't know who "they" are, but they're full of crap.
"They" want to use the AR for everything. Shoot one of our Brown or Griz with an AR 30 times and you get to on the lunch menu. And then us locals will have to go out in a group and take it down using portable canons. I don't understand why some animals, once wounded, takes so much to kill them after that but you should never bring a knife to a gunfight. And when going after an aggressive animal that will fight back, better take something big enough to do it on the first shot. You may not get a second shot or even a 15th. You may actually get the kill with an AR but there is a better chance for you to leave a wounded aggressive dangerous animal with the scent of a Human running around loose in great pain. If you are lucky enough not to be on the Blue Plate Special yourself, someone else may not be so lucky like someone child. A Shotgun, whether it's double ought or slug can do the job and so can a 458 Winchester with a single shot. Many use the ought 6, 308 and 7mm and can do the job if the shot is place well on that Hog. But I don't suggest anything smaller than that.
Yes, bears are not something I would hunt with an AR. Same Cape buffalo, or elephant, or lion. Dangerous game requires serious firepower. However, the AR is suitable for almost any North American critters.
You hate that because it interferes with your desire to ban them.