This is just untrue, hundreds of millions of rural South Asians are vegetarian.
> 3. People with a brain realize that eating meat is important.
Everyone has a brain. Both vegetarian and omnivore groups have their share of geniuses and fools. Meat was important as a calorie source but it has many drawbacks in modern society totally unrelated to animal ethics; cancer risk, inefficient land use, methane production, etc.
> 4. People with a bigger brain also realize that that eating other animals is the prerogative of power: humans have simply won the animal kingdom's oldest game and are enjoying its spoils. Things wouldn't (and shouldn't) be different if positions were reversed.
This sounds like manifest destiny rhetoric and deserves just as much consideration.