So it doesn't take much of a look on youtube to see that - far from the noble farmer protecting his crops -shooting the hogs from helicopters has turned into a business opportunity.
What used to be an expensive outlay for the farmers is now a lucrative ($2,400 dollars pp for 2 hours!) business - they clearly have no incentive to reduce the number of hogs or they wouldn't be able to sell the trips to the tourists (both domestic and foreign) who want to come and shoot things without fear of repercussions.
So I think we are back to DBs assessment of these people.