When it comes to the work of Bowlby and Ainsworth, you could hardly be more wrong, since apart from everything else they were champions of empirical observation.
I mean, is this the same Kate Murphy that wrote "10 richest U.S. presidents before Trump takes top spot" I'm not saying she's bright. She's probably smarter there most and I'd love for her to comment in on HN. But I don't think she should be writing articles titled "Yes it's your parents fault"
On the paywall thing please see https://news.ycombinator.com/newsfaq.html and https://news.ycombinator.com/item?id=10178989.
So, I agree we can't hold everyone to a super high standard of "show me the data!" However, I do think we should be moving further in that direction.
Anecdotally, in this field it is especially important. Parents get enough crap as it is. Most of it completely unsubstantiated. So, please, less of that crap. If there is advice that can help. Give it and the circumstances that it could help in. If there is a new line that people are investigating, discuss it. But don't over reach on what is capable. Present hypotheses as falsifiable assertions that people are researching. Not as assertions that are merely waiting to be validated.
And that is just the start. Once it's been shown that bad parents have permanently bad kids, how do you demonstrate causality? Maybe there is a bad people gene that they all have. Maybe the cause is the physical effects of stress during pregnancy. Or the effects of alcohol consumption: no doubt that correlates with the kind of parental behaviour that's being blamed. Sure, you can look at adoption, twins, etc. At that point, we're talking about a really impressive series of experiments, which deserve a bit more than, "it's been scientifically verified," even in a newspaper story.
That being said, where it applies, it's provides a nice explanation of interaction patterns in relationships.