Earlier quoted context omitted.
Also the way trophic levels work humans eating plants is way more efficient as a system than humans eating animals that eat the plants. Humans eating animals eating plants is an ecological disaster.
Having too many humans on this earth is more of an ecological disaster than eating animals is. Plenty of animals eat only or mostly meat, and they aren’t causing any ecological disasters.
Its worth emphasising that many animals and their eating habits are also ecological disasters. Cats, cane toads and rabbits come to mind.