If you look at the video again, it seems to be in the middle of a cow pasture and farm. I'm sure they did no more damage than what the farmer would of done anyway. I can only imagine what whould happen if a cow stepped into a soft area and it collapsed. Seems cattle types take steps to ensure their pasture land is somewhat safe.
I really give them the benefit of the doubt on this one. It was a massive ant mound in the wrong area, and I'm sure 100% of it would of been destroyed anyways. I know if that thing popped up in my front yard, as much as I love nature, it would of been gone long before it had three foot mounds..... ;)