Perhaps add in the viewpoint of the "rancher" carnivore.
Ranching tech has bred pretty mindless prey animals that can be raised and slaughtered for food as needed, no hunting necessary. These prey aren't sentient anymore, so is killing them for food wrong?
Unfortunately nearly every graph on that page is intentionally misleading. If you actually adjust the graphs for inflation (where it's relevant), 1971 looks like just another year.
Lying with statistics!