I'll reply to a couple points you made- firstly I agree, a balance is what matters. This is exactly my point- dairy is not necessary for a healthy diet- now my personal belief of it being wrong to have is irrelevant. My argument is purely defence against a person here spreading lies and claiming that vegans need dairy etc.
We simply don't. Thus I think a more humane option for those nutrients is preferable.
Second you did state one example which is understandable, there are exceptions when I think dairy can be needed. Only recently I had to purchase goats milk in an attempt to save an orphaned baby mouse. It was an exception, examples like this I understand and sympathise with. But having it as a staple food is not necessary, nor is it good in my opinion
Thirdly and finally, I'll list examples. A mother feeding her baby is natural, a different species farming mothers then removing their babies so they can drink the milk instead, is not natural. It's interesting you give the Aphid example! This is a good one- but is just not the same as farming sentient beings for a product which is meant to be for their babies. I also want to throw in that despite my argument as to what is natural to do or unnatural- nature is not always humane, in fact it rarely is. And one point I want to make is that we cant really compare ourselves to wild animals. We are smarter, we are aware of our actions and how they affect others, a lion does not know nor care if the zebra is in prolonged pain. But we know they are, and that makes it wrong to cause unnecessary suffering. We have a standard to meet which is much higher than any other species.
