Sure, there's no way to avoid all of it, but we can avoid a heck of a lot of it. So why don't we? You seem to take a certain amount of carnism as a given, but I don't see for most people in the developed world why it should be a given, especially in light of the fact that meat isn't needed for subsistence.

If you agree that it is for taste and nothing essentially more, then we have to ask ourselves whether the suffering endured by slaughterhouse animals (in addition to the other environmental concerns I listed) is a worthy price for our pleasure. Without pointing to other irrelevant facts about nature or history.