Some farmers actually agree to let them do it. As far as the debunking goes, the makers have actually filmed themselves doing it, so you'll have to check those debunkers. You might be dealing with some Art Bell types there.
The makers HAVE given interviews, taken credit, and have written articles. Start at with Circlemakers, and go from there.
"If human pranksters made the formation... they would have to average one circle every 2 minutes and 20 seconds - to say nothing of laying out the whole design and executing it flawlessly. If people made it, they should be running the government, things would get done quickly and done right, for a change!"Peter Sorensen writing about the DNA crop circle in: Amateur Astronomy Aug/Sep 96
I'm sure there are guys who would love to take credit for this. Algore maybe?
Long Cut? Isn't that the name of a secretive crop circle society?