Maybe more rodents and insects get killed IF our vegetables come from big corporate farms that do everything with machines. However, that is not the way we want to do things, and I think I speak for a large segment of this community, when I say that we prefer to purchase vegetables that come from small, organic, sustainable, eco-friendly farms. Ultimately, that is the best answer for the planet, because it would combine the best usage of land with the healthiest practices. (Incidentally, raising cattle requires many times more acreage to feed an equivalent amount of people, particularly if you want to avoid desertification of the land.)