Great point, and I have to admit you're right for this particular application.
When I had first gotten my 12 gauge when I was still a teen, I let a rabbit have it from about 20-30 feet with a charge of number 9, and it basically turned him into a rag, a real waste because rabbit is some of the best eating anyone could ever hope to have.
Interestingly enough, I pulled off a real fluke few minutes later by picking off another rabbit at well beyond 75 yards, again with number 9, a very long shot on bunnies, and most folks would think number 9 couldn't possibly have been big enough to bring him down at that distance, but there he was.
Of course, that second rabbit was very lightly peppered with shot, and he was excellent on the table later.