You raise an interesting point about the difference between intent and outcome. Making the factory farm analogy makes it appear that you are hijacking an issue to push your own agenda.

To paraphrase you: The soldiers weren't out there with the express intent of killing civilians, but farms do have the express intent of killing animals. It's not that you equate human loss of life with animal loss of life. It's that you equate accidental loss of human life with intentional destruction of animal life.

In response I would say that we all draw that line somewhere. Humans don't tolerate unlimited cruelty to animals, even if it is beneficial to us.