@harveyg I agree with you in that anti-attachment has a strong hold on white America--I would call it the British colony effect. I think it has particularly infiltrated the practice of medicine and early psychiatric and educational models (there were other educational theorists early on, but the behaviorists won out in school culture).
However, there are pockets of exceptions. I grew up in a white, working to middle class family in the Midwest. Both sides of my family come from large farming communities with a sprinkling of white collar workers and professionals in there.
Anyway, my point is that both sides of my family genuinely appreciate children. They weren't "crunchy" by any means, I wasn't breastfed, or worn, and gentle parenting wasn't really a thing. But, I can definitely see healthy attachments between parents and their children overall. Because the adults like kids, love holding babies, enjoy interacting with kids of all ages, and generally treat them like human beings and integral parts of the family. All ages mingle at family gatherings. All my Boomer aunts and uncles-as well as the Silent Generation greats-- are the best grandparents, with close relationships with their own adult children.
And it's this fundamental attitude that I found lacking in the larger culture around me, where children and babies are considered a nuisance and a burden. I would call this attitude the fundamentals of "attachment"-- overall responding to and caring about your kids' needs and not dismissing them. Which can be completely separate to the "attachment parenting" choices about feeding, sleeping, etc. I do agree that the AP behaviors help develop that attitude (and made life much easier for me as a parent), but they are the tools to get there, rather than "the thing" itself.
My family certainly isn't perfect... some dysfunctional communication, less than ideal parenting decisions and attitudes on some things, they're not all on the right side of the fence politically/socially (IMO). I'm not proud of every individual, and there are people I'm more distance from. But, I can see the benefits of core attachment principals (the theory, not parenting style) throughout the generations in terms of how family is treated. And I think each generation for the most part has gotten better at parenting because we had a decent (if imperfect and slightly cracked in places) foundation.