I have no problems with cats but i hate how they kill poor little mice and birds, even if well feed and cared for.
If there weren't cats around to kill mice and rats, you would be amazed at how quickly those populations get out of control.
Around here, people put out poison. In 2011, for the first time in memory, no cats were dumped here on the farm. Those of the cats dumped here the prior year that I hadn't brought into the house hadn't even made it to the winter (probably a combination of the larger predators such as coyotes and foxes and getting poison indirectly through poisoned rodents). So, there were no outdoor cats here in 2011 and the first part of 2012, and there was a rat explosion you wouldn't believe. In the fall of 2011, I adopted two feral cats through a barn cat adoption program and put them into the chicken house because I was worried that the rats would start attacking the chickens. (There were dozens of rats in the chicken house, who didn't even bother to move for cover when I would come in.) That worked out beautifully, without fatalities, because the rats moved out of the chicken house when the cats moved in. But in the meantime, during that year, the rats ate the electrical wiring in my car (a $6,000 repair to have the whole system replaced), ate the central air ductwork in the attic (my cats don't have access to the attic) which would have cost thousands more to repair, chewed holes through the flooring of the duck house which I only discovered after a weasel used the holes to get into the duck house and attack my ducks, etc. If I didn't have cats in the house, they would have swarmed the entire house.
I used every non lethal method I could find to keep the rats out of the car. Nothing worked. Since the car has been fixed, I have kept it parked in town, three miles away, and get to it by means of an old clunker I got for that purpose, which I park within walking distance.
Obviously, I refuse to use poison or traps, but there's been a high price to pay for that. These guys are very smart, and very adaptable. When cats were again dumped here last summer, I realized it before I saw any of them, because from one day to the next, I didn't see any rats. (They were not at all afraid of me, and would come within a foot or two of me as they went about their business.) They obviously have a good communication system amongst themselves, because they all went underground at the same time.