I consider it highly unlikely that wolves would prefer humans to the goats that these three were herding. Wolves are generally afraid of humans, and for good reason - the ones that aren't end up extinct after wolf-human encounters. Besides, there are limits to how considerate you can be of foreign civilians. They weren't a SWAT team back home. Every Afghan civilian in that region was a potential hostile, and that went double for the males.
Just telling you what Luttrell said in his book.