It comes from cows. Cows are not incongruous with primal living.
Butter is only a problem if you have a dairy tolerance issue.
I follow the logic behind the relatively high animal fat/low starch philosophy. I'm clear on the ideas supporting the conclusion that the chemical composition of the fat content of the meat that's readily available to those of us on an expense spared budget is not nutritionally ideal, and should therefore be supplemented or substituted.
What I don't follow is why butter is deemed to be such a good substitute/supplement for that fat.
I was optimistically hoping that people could present plausible reasons why butter is so popular on this forum as an alternative to proper animal fat, when it it comes from such a source so seemingly incongruous with the Primal philosophy, i.e. stuff we've evolved to eat.
in the alternative, use lard or bacon fat. works just as well.
i really only cook my eggs in butter. everything else gets lard of some kind (if needed at all).
How are cows not incongruous with Primal? From my admittedly brief googling, domesticated animals have been around for maximum 20,00 years, which isn't an evolutionary time scale.
Stating "Butter is only a problem if you have a dairy tolerance issue" doesn't really help - I don't have a wheat tolerance issue, but I've read enough to convince myself I'm better off without it.
I use butter on my veggies or when a recipe calls for it. Otherwise I cook my eggs in bacon grease/fat, and use coconut or olive oil for meals that require a little grease before cooking.
Butter is predominantly milk fat which although not a Paleolithic food, we can process no problems. Butter also contains milk proteins which can be problematic for some people, but most people seem to handle them fine.
I think the issue is that there is a perception that butter is, in some ways, a processed fat - it doesn't come out of the cow as butter, it comes out as milk. A certain amount of technology (a jar, at least) is required to turn it into butter. Also, there's the whole "humans are the only animals who eat the milk of other animals" argument.
As for the first point, while butter does need to be extracted from milk, other animal fats aren't really usable for cooking unless they're rendered, which is a similar process - removing the liquids and impurities from the fats. Rendering is usually done in a fllame-proof vessel, often using water, over low heat for a long time. By contrast, making butter involves no heat at all, so is arguably better in that it leaves the fats unaltered.
The second point is not actually all that true - wolves who kill livestock will eat the udders out of lactating goats, cows and sheep before they eat anything else. Many cats and dogs do very well on milk (some not so much - my last cat was clearly lactose intolerant) and the very best pork is fattened on whey and chestnuts or acorns. When it comes right down to it, the reason we're the only animals that consume the milk of other animals is because we're the only animals with the combination of empathy and brains to get those animals to trust us enough to let us near their lactating parts, AND WE HAVE OPPOSABLE THUMBS so it's actually physically possible for us to do it.
Grass-fed butter is good eats. High in CLA, vitamins A, D & K2, mostly saturated, and tasty too. But, like anything, if you don't tolerate it well, it's not a good idea. I can't eat broccoli - I lack an enzyme of some sort to break down the sulfates in it and it gives me horrible, horrible tummyaches & sometimes barfing - but I don't dispute that it's a fantabulous vegetable with all kids of healthy benefits and yum. If you don't feel good after eating butter, don't eat it - but it doesn't mean it's not good food for others.
Your approach of "food reenactment" is not basically Primal nor is it a great way to think about Paleo. The evolutionary argument is really just a backdrop / backup for lack of available good nutrition science. I don't eat wheat BECAUSE ITS BAD FOR ME, not because cavemen didn't eat it. There are almost NO vegetables and fruits you can buy today that are the same as what "Grok" would have eaten, same for animals - would you prefer we stick to principles and say "NO" to everything but wooly mammoth meat?
Read Kurt Harris' posts on dairy and his "the only good paleo principle" - butter is basically just animal fat and just about everyone's bodies process it as such. Give a cat or dog some salted butter or cream and see what they do with it.