It was a quick example of what a basis might be. But I'd say most people do agree with that when considering unacceptable actions towards other humans. Laws against torture, cruel and unusual punishment, seemingly predicated on infliction of pain plus empathy. Or euthanasia to cause death to avoid pain. If it's arbitrary to apply it to animals (and it is) it's also arbitrary to apply it to humans.
There's actually a very good and sensible way to differentiate between them. If we started eating humans, the harms would easily outweigh the gains. There would be wars over it, and it would greatly weaken society and the human race, not to mention the immediate harms to the first cannibal.
On the other hand, eating meat is one of the main things that allowed humans to develop interest. It's a very good and economical way to produce food, and it's easier to maintain a healthy diet when meat is on the menu. Overall, eating meat has a great amount of benefits, when it's only drawbacks are some vague moral concerns most people don't share.
So I just need to start from the assumption "I care about humans more than cows" and it's easy to reach the perfectly logical conclusion that it's all right to eat cows and not all right to eat men.
True for most of the arguments here. I don't think "because it tastes good" by itself is philosophically defensible, unless the person stating it is fine with cannibalism.
If that's not a sound argument, then what kind of an argument do you present for eating, say, a carrot?
Excuse is a bad word. Can't remember if I've used it but I prefer "explanation". If someone started a thread about explanations for why it's acceptable to watch TV, I'd consider the answer in at least a bit of depth. "because it's entertaining" is a fine general answer, but if the OP is looking for a moral answer it might be "because the manufacture of the TV doesn't cause harm to anyone" or "because I'm an egoist more than a utilitarian, so watching TV instead of helping mankind is acceptable".
You may not have used the word, but "explanation" in this case means pretty much the same; that there needs to be some explanation beyond that I want to do it. That presupposes there is something wrong with the act as such.
Anyway, you have been given answers similar to the ones in your TV example: "we are omnivores and eating meat is both natural and beneficial to us" and "eating meat doesn't harm anyone". Not precisely with those wordings, but the idea has been presented several times. Yet you continue calling these answers "not deep enough".
But it's obvious that many if not most humans care about animals and believe they should be given at least some moral consideration. There aren't head-scratching scalp rights groups that I'm aware of. I'd hope people would approach this somewhat seriously considering this. Animal rights advocacy is a real phenomenon.
So is Scientology. Anyway, we have approached the question seriously (and occasionally in jest), analyzed the arguments, and concluded we don't believe animals have any rights, and thus eating meat is not a moral problem. I, and one of my favorite philosophers have given animals moral consideration and decided they are not moral subjects. Only humans are, and as such, hurting an animal is only morally wrong if one by doing so also harms a human.
The reason I think animal torture is immoral is not because I worry of the suffering of the animal; it's because I believe the act of torturing an animal causes damage to the torturer's mind, making him less human. I think some of the huge farms of today are, in essence, torturing animals, and are slowly killing empathy in humans. I do not condone such facilities. But I don't think there's anything wrong with hunting animals or butchering them efficiently. And certainly not in raising them in "humane" conditions, even for butcher.
So the problem isn't that we don't consider the moral issues - we just reached a conclusion you don't seem to agree with. You can present arguments for why you think we're wrong, if you like, but please don't claim our claims are somehow less deep or philosophical than yours.