I think their point is that a species cannot suffer, only individuals can. Under that consideration, it seems downright hilarious to keep individuals perpetually suffering just to keep a species that didn't occur naturally anyway alive.
The whole topic becomes a straight farce once we realize that our "conservation" of these species costs us thousands of other, far more ecologically useful species. Like in the rainforest, for example, where we grow feed for cows, and pasture cows.
The whole topic becomes a straight farce once we realize that our "conservation" of these species costs us thousands of other, far more ecologically useful species. Like in the rainforest, for example, where we grow feed for cows, and pasture cows.