When people actually investigated claims of mysteriously mutilated cattle here in the US, it was (eventually) noted that these "mysteries" tended to ocurr in areas defined more by county lines and which cattle farmer was related to the sheriff than to any airforce experiment, monster, or alien incursion. It goes without saying that the newsies just ate the story up at face value and neither bothered to actually investigate or follow-up once the real causes were found.
Now it seems Argentina is having the same problem. Probably the same causes too. Gotta love those insurance scams!