I have to doubt this kind of thinking. Sure they may not have personally butchered a cow, but your typical human will happily crush insects, or poison and trap

I have to doubt this kind of thinking. Sure they may not have personally butchered a cow, but your typical human will happily crush insects, or poison and trap various pest animals. Plus the usual hunting and fishing. If it was still necessary to personally cut the heads off chickens to get chicken meat, I suspect you'd see virtually every household doing so.