[Bartweiss]

I've always been conflicted on the "don't know how it's made" argument. On one hand, I've known people who learned about farming practices and butchery and were horrified (but most went back to meat after a brief stretch of dissonance). On the other hand, I grew up knowing what butchering an animal involves. It never turned me (or a lot of other people) off of eating those animals.

I think you're right - it's not that ignorance is required, just that the moment of discovery is a bit shocking.