I know how over whelmed all rescues are because people are so careless when it comes to having pets. Some people are so irresponsible to the point of being heartless. In my opinion, when you agree to adopt an animal, either from a shelter or a pet store, it is your responsibility to provide that animal a loving forever home. Animals are not objects and should be a part of your family.
While it may seem sad that these buns are coming back to the rescue and again in need of forever homes. You have to look at this from a brighter angle. We have all seen what happens when people try to juggle too much at once. The suffering falls onto the animal. In my opinion, I would much rather have someone bring that animal back to a shelter than to allow it to suffer from lack of love and care. I guess because my two recent additions were left in a small cage next to a dumpster, totally helpless- I can at least give the people credit for realizing they were in too far over their heads and did the responsible thing by turning them over to someone who could properly care for them and do everything in the animal's best interest.