We have to fight fire with fire. The pet enablers think they have words like "compassion, non-lethal, and humane" patented, and use them incessantly on our politicians.
Remember Frank Luntz, the speech coach Rove used to teach the GOP to frame their discussions? You could get the votes of an entire forum of birders with a closeup picture of the remnants of a clutch of murdered fledglings. The politicians have to be reminded feral cats are a destructive abandoned pet species.