"We" most certainly did not create this problem. The feral cat problem, and the mongoose problem, pre-existed the birth of anyone alive today. The cat problem is continued by the large number of people whose goal is to feel good about themselves by being nice to anthropomorphised feral cats. They are predators which destroy incredible numbers of birds and pollute the environment as well. Feral cats are in fact a form of biological pollution. We probably cannot wipe them out but we could dramatically reduce their numbers by all out hunting.