I like having them around. Good to hunt all year round, tailor made for bowhunting, every hog is a trophy, and they taste great.
They sure haven't affected the deer population in my area. I've yet to see a deer root for grubs, or a hog eating kudzu or greenbriar leaves. I think the biggest competition between hogs and deer is gonna be at the corn feeders.
In My Area.....hogs don't do much damage. It's hard even for hogs to screw up steep terrain comprised mostly of rocky, sandy soil filled with pine and blackjack oak.
But, I'm aware other places do have problems. And I hate to hear about anybody losing money to a feral critter. But have any of these guys decided to break open their checkbook and do some fence modifications? Maybe run a hotwire or two? There's ways, but it might require some financial thought. For the amount of money some farmers spend on equipment every year, they can afford to pay some local high school kids to bury some wire paneling in the ground to keep hogs from digging under. Me and 4 other fellas did that back in '95 around a 400 acre peanut field in exchange for beer when I was 18, and that land is still hog free. Just takes some elbow grease, some money, and some gullible 18 year olds.