I am well aware that my furry little creature with a leg in each corner is a killer. That is one of the many reasons I keep cats. When I first moved here, the house and outbuildings were overrun with mice, chipmunks, and squirrels. Now 20 years later there are no mice in the house and the chipmunks and squirrels are down at the outbuildings where they belong.
I also keep chickens, for their eggs. Chicken feed attracts mice, chipmunks and squirrels as well as the chickens themselves attracting other animals. The cats keep them at bay.
And while we are on the subject, two of the neighbours dogs have come into my property (not at the same time as in pack mentality) and killed a total of 26 of my chickens. The first one, the neighbour paid me for the chickens (2). The other one killed 24 chickens before I caught it. This was the second and last time that dog killed any chickens. The first time this dog did the deed I couldn't catch it, but the second time it was having so much fun that it forgot the way into the pen and I caught it....End of dog. The owner of this dog wouldn't pay for the chickens the dog killed and wouldn't help clean up the mess, either.
Now, my dog protects the chickens by barking its head off when anything comes on the property that she feels is not welcome here. She got tangled up with a Porcupine last summer. I'll bet she will keep her distance if she meets one again.
As for studies and video evidence and statistics, I don't give a rats behind about them. Statistics/studies can be bent in whatever direction the one ordering the study wants.
As for emotion, my cats are way more loyal to me than any human has ever been and they NEVER stab me in the back, steal my stuff or beg money off me with no intentions of paying it back.
I will continue to keep cats as long as I am able to look after them. After that, there are plans in my will for the cats to be looked after.