The "amount of time, effort and storage space required to keep enough vegetables on hand for a vegetarian family is rather immense."
Yeah, all that tofu is pushing us out of our house! Eeeek!
Seriously, pltrygeist, I cannot believe that you view the killing of plants as the ethical equivalent of killing an animal.
If I were to go over to your house and do two things, (1) torture your dog, and (2) pick one of your flowers,
would you view them as morally equivalent?
The issue here, for me, isn't "science," but morality.
Ethical vegetarianism -- at least for me -- is based on the following assumptions:
1. My experience of pain derives from my possession of a central nervous system and a brain. (Understand here that when we talk about "sentient beings," "sentience" means capacity for pleasue and pain. "Sentience" does NOT mean, as it is often misunderstood to mean, "capacity for thought or choice.")
2. Because I am sentient, I wish to avoid unnecesary pain. I also wish to delay my death.
3. Those who inflict unnecessary pain and death on me would be behaving unethically because they would be harming me unnecessarily.
(Understand here, the most important assumption is that "unnecessary harm = unethical.")
4. I assume that nonhuman animals possessed of similar central nervous systems also wish to avoid unnecessary pain and death.
5. Therefore, it is unethical for me to inflict unnecesary pain and death on nonhuman animals.
I don't KNOW any of this for sure. I am ASSUMING that animals feel pain, and I am ASSUMING that they do not want to be killed.
These assumptions are consistent with my observations of animal behavior.
But hey, who can really say? Maybe gotbeer is right -- maybe animals WANT to be killed for our dining pleasure.
I think that gotbeer is insane and he frightens me (he LIKES the idea of hurting animals). I think my assumptions are by comparison sane, and reasonable.
As for plants,
(1) Human and nonhuman animals evolved to have a pain response in order to survive: pain induces them to avoid events that inflict injury, thus increasing their chances of survival.
(2) Plants do not have the same pain response because they lack the capacity to move in order to avoid injurious events.
(3) Finally, I am assuming that if plants DO have a capacity for suffering, it is not based on the possession of a central nervous system and it is not sentience as I experience it.
(4) Therefore the suffering of plants does not have the same moral implications for me that the suffering of aniimals has.
Again, these as assumptions.
But let's say that plants DO suffer when we eat them
OK, so what? The fact that SOME suffering may be inevitable does NOT justify one in inflicting MORE and UNNECESSARY suffering.
(This reminds me of gotbeer's fallacious argument: "suffering and death is unavoidable therefore I can go around and inflict more suffering and death with a clear conscience.")
No. That's not right. You cannot go and inflict unnecessary suffering and death on a human or nonhuman animal and then justify your actions by saying "well plants are hurting, too!"