Now, if you don't "helicopter parent," then A. other parents will look down on you, and B. your kid probably will go off track and end up as a street thug in some gang or as a couch potato because the surrounding culture is not as much of a supportive ally. (Now why is that?)

B strikes me as unlikely, or at least not much more likely than it was twenty years ago when I was a largely unsupervised preteen. Everything I've read about childrearing suggests that parenting style (short of abuse or utter neglect) has very little effect, suggesting in turn that the contemporary norms of "good parenting" have much more to do with signaling than actual outcomes.

The popularity of a belief is, strictly speaking, evidence against its being a delusion, but it isn't necessarily very strong evidence. Especially in a field as rife with superstition and bullshit as parenting.