we know that as a species our brains would not have evolved in the way they did had it not been for meat. had it not been for our ancestors taking in protein, it would have been physically impossible for humans to evolve as they did, and we would not be the thinking creatures that we are today.

so, had it not been for meat, we would not have the intellectual capacity to debate the morality of eating meat.

aside from the obvious irony, this to me suggests that it is not immoral to eat meat.

now, whether we would be better off from an environmental perspective is another story.

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"Even a stopped clock gives the right time twice a day." Withnail & I