I would've said the same thing as you in the 'guns' thread. I really couldn't be bothered arguing with that person + it would be off topic.
You made good points:
Our teeth have nothing to do with carnivorous diets, Pandas have sharp teeth like any other bear however they are mainly herbivores (bamboo being 99% of their diet). An excellent point you made.
Yep, there is no way of killing an animal without cruelty, no animal wants to die. Only an idiot would believe that, lol.