"Vampire society" -- for naturally nomadic creatures there's a weird juxtaposition of words
Wouldn't you agree?
For the most part in Twifandom, this seems to be the sentiment. "Vegetarian" vampires? How noble!
And couched in those words, it certainly seems that way — after all, the Volturi treated Carlisle as an honoured guest, ... a curiosity, but a guest, none-the-less — but let's look at it from the vampire perspective. Or, more correctly, let's transform the vampire perspective to the humanist one. Let's look at the Cullens through your eyes, if your eyes were vampire ones.
You know this doctor and his family, and they are well-bred, well-dressed, refined and educated (the kids are a little weird, what with Edward always grimacing and Alice always going off into these traces, but Rosalie is sure easy on the eyes and both Emmett and Jasper are both manly men), so you invite them over for supper. You prepare this feast, spending days in meticulous preparation to get everything just right, you invite the Cullens over, present the feast, but they just shake their heads at you, snobbishly, and say they follow and alternate lifestyle when it comes to food, and they bring out their own meals which are ...
Which are bags of vomit and horse manure (c.f. MSR, "Compulsion").
Now, you have the "turkey" and the "roast beast" on the table, you have the "red wine" out. Everything's perfect for a refined and elegant family that the Cullens, up to now, appeared to be to you. You try talking some sense into them.
"We prefer this way because it doesn't hurt those poor, innocent creatures we so love!" they exclaim. And then they start eating that ... well, that stuff right in front of you. Imagine it: your guests, eating horse manure and vomit, over your protests.
I'd be willing to bet, if this was happening in front of you, you'd kind of lose your appetite, right?
I'd be willing to bet, the next time you'd think about inviting them over, you'd check with them first to see if they were still on that "diet," and, if they were, you'd probably find some conflict in your schedule.
I'd be willing to bet, if they kept this up, and they started extolling their tastes to you and your friends, you'd ask them to take their business elsewhere, and also very seriously consider calling the Department of Health and 'Human' Services, and for good measure, Homeland Security, as anybody who ate that stuff, by choice had to be off their rocker and more than likely a threat to you and yours.
Vampire 'vegetarianism' ... still a noble choice? Or, perhaps, looking at it through the eyes of a vampire, might you not possibly see this lifestyle choice as ... well,
Does the most recent chapter of MSR ("Lillian, Arise!") now make better sense? Those mean, mean Volturi, stamping out the Cullens like that, aren't they really just removing undesirables?
I mean, after all, you call the police to break up domestic disturbances in the next apartment over due to the "devil in a bottle." If your neighbors were really eating that kind of food, stinking up the whole building, going door to door trying to proselytize their twisted lifestyle, you would be glad to have the police cart them away, and all your neighbors would pat you on the back for a job well done.
Do you now see why the Cullens' lifestyle took so long to become apparent to Carlisle and the others? Do you now see why it hasn't caught on like wildfire with other vampires?
The amazing thing to me? That they have so many friends ... dear friends, too ... Peter and Charlotte particularly take time out of their schedule to visit them (cf. Midnight Sun). And all the support they had in BD, Book III was not only self-serving (*ahem* Stephan? Vladimir?) but from friends across the world (the Amazon, Ireland, England, Egypt (not so much)) who came to them to support their friends to allow them to continue to live this very odd lifestyle.
Vampires have a more kindly nature than what I would have imagined for creatures designed to be perfect predators.
"Kind for a vampire" ... indeed!
I'm still not going to go into a dark alley to meet one, however. Nor should you, Miss Oh-Bite-Me-Edward!