It also seems that there are firms out there doing far more scientific hog culling using traps and enclosures - yes they still shoot them in the end but they avoid dispersing the hogs the way that dog and helicopter hunting does which both create more damage not less.
FYI:
From the scientific side, it is impossible to mechanically eradicate all feral hogs as they are too prolific and smart. In Texas for example, in order to keep their 2 million hog population in check, it would require the harvest of 1.25 million hogs per year. They barely achieve 400,000 each year and this is with a 365 day, 24/7, legal hunting season. Traps tend to work one time then must lay dormant for months or moved as other hogs will not enter the trap after the 1st use.
Considering hogs cause over a $1 Billion in damage in the US alone, a niche industry has sprung up with aerial hunts as shown in the video. There are quite a few ops out there. There are also professional aerial hog hunters who specialize in night flights from either a small fixed wing or helicopter using thermal imaging sights. Given a farmer can incur up to a $70,000+ loss in one night, the issue is very serious in the agricultural belts around the country.
The latest move over the past several years has been toward developing a poison that will kill just the hog and leave a biological marker that it was poisoned in case the animal is harvested for sport. Regardless, even with a lethal poison it will still be a chore to reduce the feral hog populations in my experience. Just be thankful they haven’t figured out how to swim the big pond… yet.