Besides, we kill more animals coming after your precious growing plants than we do deliberately for food

That's just not true. It takes far more crops to produce animal products than just eating plants for food. Feeding another being is a process that is very lossy for energy (they move around, have body functions, etc. that use up that energy)

"1 kg of meat requires 2.8 kg of human-edible feed for ruminants and 3.2 for monogastrics"

https://www.sciencedirect.com/science/article/abs/pii/S2211912416300013

"If everyone shifted to a plant-based diet we would reduce global land use for agriculture by 75%. This large reduction of agricultural land use would be possible thanks to a reduction in land used for grazing and a smaller need for land to grow crops."

https://ourworldindata.org/land-use-diets

"Plant-based foods have a significantly smaller footprint on the environment than animal-based foods. Even the least sustainable vegetables and cereals cause less environmental harm than the lowest impact meat and dairy products [9]."

https://www.mdpi.com/2072-6643/14/8/1614/htm