The goal of veganism is to minimize harm. It is obviously unrealistic to expect to feed 7 billion humans without harming other animals in the process. Feed for animals destined for slaughter requires much more farm land than it would take to grow crops for direct human consumption, so even just by the metric of preventing harm to wild animals a vegan diet comes out ahead. I expect a vegetarian diet would be in-between them.
The goal of veganism is to minimize harm. It is obviously unrealistic to expect to feed 7 billion humans without harming other animals in the process. Feed for animals destined for slaughter requires much more farm land than it would take to grow crops for direct human consumption, so even just by the metric of preventing harm to wild animals a vegan diet comes out ahead. I expect a vegetarian diet would be in-between them.