Why not simply trap and euthanize them?
According to Richard Allen, D.V.M. of Best Friends Sanctuary in Utah, “…euthanasia have been ineffective in controlling feral cat populations because the remaining ferals become more fertile and reproduce more to fill up territory that was vacated by the euthanized cats. Moreover, euthanasia increases the spread of disease because the remaining cats have to fight it out to see who is going to inherit the vacated territory.” HCP believes that all animals, including homeless cats, have intrinsic value. They have a right to live and humans have a responsibility to help them exist with the least amount of suffering. We feel that what happens to them matters to them.