I'm all for radicalism since radicals are the main force questioning conventional wisdom. But the size of the vegan movement is totally out of proportion to its veracity. Take the whole "meat is murder" slogan. It's ridiculous from the outset and completely ignores our existence within the earth's ecosystem. I mean industrialized animal farming is fairly horrific, but the way to stop that is by advocating and paying…
Just a minor point, but what do you mean by “sustainably raised meat”? It seems reasonable to assume that the production of non-industrialized meat needs just as much or even more energy. Meat is cheap because it is efficiently produced, mostly disregarding the animals’ welfare. How can energy consumption go down by shedding efficiency in favor of animal welfare? Is that not what you mean by sustainable?
For example, sustainably raised beef winds up needing a bunch of pastureland to rotate through, so that they don't overgraze any one section of grass. Feedlots cram them in and feed them corn or some other grain crop that's had it's own huge energy input.
Poultry needs the same sort of thing, or they will scratch their grass down to mud right quick. Most of the cage-free/free range criteria stop in the 5 sqft/bird range, but they need 10x that to not destroy the ground, if they're not moved every few days. (incidentally, vegetarian feed for chickens is good (hey, it won't contain other chickens), but chickens are _not_ vegetarians. They love bugs. Happiness is a flock of chickens and an ant hill.)