Would one of those actions be the urge to have sex? If not then not sure what we are talking about here.
I think the majority of people who have children they can't provide for bear the responsibility for that and I don't really see where in that you want to plug your nuance - but if you have something more than "there is nuance" I would love to hear it.
1) They have always been struggling, a didn't have a reasonable plan originally, and/or
2) They didn't take reasonable precautions to avoid pregnancy but still end up pregnant, and believe their best option was to raise the child
Both of these assumptions are clearly false in general although I don't know enough about the issues to hesitate a guess on percentages.
I was mostly thinking about (1). Someone with a partner and a solid household income can easily become a struggling single parent, for example, without having made any obviously bad decisions.
https://www.businessinsider.com/parents-determine-child-succ...
> The researchers further suggest that the "fraction of children living in single-parent households is the strongest correlation of upward income mobility among all the variables we explored."
See also: https://www.nationalreview.com/2018/02/single-mothers-new-yo...
The black/white thinking espoused above, though: I doubt it leads to real insight or improvements.
It is very difficult to look at a random average person and predict whether they will become poor within the next 2 decades.