I got where you’re coming from but meat is one of the most nutrients packed food you can eat. Also, evolutionary people did not become the top of the food chain by eating plants.
Yes, it’s terrible how animals are being treated and yes mass consumption of meat has some terrible side effects.
With that being said: do you think that in the wild a predator will think twice about killing and eating their pray? do you think that every person on Earth could turn vegetarian and be able to get a healthy diet tomorrow?