The primarily rodent diet is a conclusion based on solid science but observations about their hunting ability and opportunistic kills of larger animals are well supported also. The scientists who made that conclusion most likely studied yotes as far as possible from the influence of man, not the ones we most often interact with. They are intelligent, able hunters and will do what it takes to survive. It's unreasonable to expect they'll pass up an easy meal of chickens or other livestock and pets when the opportunity presents itself. If an animal causes a problem with other animals that we consider beneficial then I think we have a responsibility as hunters to help resolve the problem. It doesn't hurt that many find it an enjoyable sport.