I don’t quite follow your argument. Are you suggesting it requires more cropland to make vegan food than meat? If everyone ate crop-derived foods in place of livestock-derived foods, we’d need less cropland, because livestock animals are not perfect energy converters. I.e., it takes more than a pound of feed to get a pound of beef.

Or are you saying it’s hypocritical of a vegan/vegetarian to eat products of agriculture because of the damage to the natural environment and animals which reside in it? The only non-hypocritical thing for me to do in that case would be to kill myself. Forgive me if I don’t. Perfect is the enemy of good, and so I’ll choose to minimize harm where I can.