Plants aren’t sentient though, that’s a pretty good reason to put them lower on the hierarchy of living beings that are morally ok to eat. And it’s quite likely that fewer plants die for a vegan diet than for a standard diet, as animals need a lot of feed to produce meat, eggs and dairy. Some percentage of the plant protein, fats, and carbs will always be lost along the way when we feed them to animals, so eating those plants directly is more efficient.