One could argue that the exploding population of Feral cats are a product of human negligence.  As such, they may benefit us in allowing us to realize that we do have a responsibility to recognize that our actions, in this case abandoning and/or neglecting to spay or neuter domestic cats, can have serious implications on the environments in which we live.  For more information on trap-neuter-return programs including how to begin one in your community please visit the ASPCA website at www.aspca.org and search Feral Cats or visit the Humane Society of the United States