Sterilization alone won't prevent the existing feral cats from further predating (killing by ripping, piercing, and tearing actions) the native species.  Neutered cats also continue to defecate into the water sheds and food supply, spreading Toxoplasma gondii.  I have no problem with lethal control of feral cats, especially in high priority areas, such as wildlife preserves with endangered species and watersheds that run to the water supply sources and the ocean (oh, that is just about everywhere).  There is NO EVIDENCE that neuter release programs will reduce the overall feral cat population, as it is too little too late.  You can't neuter just 20 or 30% of the cats and pray the rest of the intact cats will suddenly start using the rhythm method of birth control successfully.  Then there is the economics of euthanasia of feral cats, versus the cost of a surgery on a feral cat...$6 or less, per cat for euthanasia...versus $90 or more for surgery and transport etc.

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