Pigs have the cognitive ability to be sophisticated. Even more so than dogs and certainly three-year-olds.
I would eat three year olds if it were:
1) Culturally acceptable
2) They tasted good
3) They were good for me
4) Farming them were more economical
5) They didn't have the potential for much greater cognitive ability
6) I weren't wired up to feel sympathy for cute things
That last one seems to be the most important issue when it comes to eating critters, and most of the reason we don't strangle babies with their fucking umbilical cords.
And #5 can be used as an argument against eating sperm. Or, if you're only imperceptibly less retarded, against abortion.
I have a vegan friend who's practically militant about it. We've had the argument. We don't need to have the argument every fucking time. I make a point of eating pate around him whenever possible just because he's an asshole and I'd like very much for him to try to physically stop me so I could slug him for it.
I don't even like pate, but geese are assholes, too.
Actually, this whole issue could be avoided if we just started breeding food critters to be ugly, stupid and fucking mean. Except I can't imagine many things meaner, uglier or stupider than most of what we're already eating. Or most people.