In 2002, the family was physically threatened when one of them stumbled upon a group of 39 illegal aliens. They were told to get off the land and they made threats. The Border Patrol did catch the illegal aliens after they were called, but we all know that illegal aliens, if deported, come right back across.
Tancredo notes that the Krentz's did mention to him that they called the Border Patrol.
Those were both from SNAFU's link above. It sounds to me at least like this guy was doing the best he could. A 35,000 acre property, 12 miles from the border; there's no realistic way he could police it. So rather than let human beings die on his property, he gave them water and called the Border Patrol.