Many modern advocates use "rights" as the horizon and "welfare" as the road. They argue that improving welfare standards (larger cages, better stunning) is a "Trojan horse." Once society realizes that animals suffer, and once industries are forced to spend money on "humane" upgrades, the economic incentive shifts toward plant-based alternatives.
The animal question is ultimately a human question. It asks us: Is our dominion a license for tyranny, or a burden of stewardship? As historian Yuval Noah Harari noted, the agricultural revolution was history’s greatest fraud for farm animals. They entered into a biological deal with the devil: safety for suffering.
However, there are tectonic shifts. Several countries (France, New Zealand, Switzerland) have legally recognized animals as "sentient beings" rather than objects. In 2022, a court in Argentina recognized a chimpanzee as a "non-human legal person" with a right to habeas corpus (freedom from unlawful detention).