Hunt pigs much?
They are either hunted by dogs or from a blind and usually over bait to make them come in so you can get a shot.
Hogs don't attack unless cornered or you seperate a mother from her young. And a bunch of guys yacking and walking around shooting shotguns is going to send every hog in the area running in the opposite direction.
If you hunted hogs much, or at all, you would know that.
But if you need to rationalize a reason to carry I guess hogs can be it. Heck, carry something big so you can protect yourself from rampaging elephants too.