On one hand, it's 100% obvious to anyone unbiased that sometimes an answer to the parenting problem (the "why", at least) is "because the child is a child of a single parent".
Both as a scientific finding (e.g. cited here, here, here - I picked out all 3 specifically since they are left/liberal, and thefore unlikely to suffer from political bias that a right wing source might be accused on the topic)
As well as (on-topic and valid from this site's perspective), my own personal experience as a parent. You can barely deal and keep up as a married parent. And I see plenty of examples of unruly, poorly behaved children of single parents, clearly enough to be a noticeable trend (and, should someone say "plural of anecdote is not data" or "correlation!= causation", see the research conclusions in the bullet above this one)
On the other hand, I'm worried that posting a factual, valid answer rooted in this would be met with heavy hostility at best, and moderated out at worst (including suspension), either because people assume that "be nice" policy means "fully support and validate everyone's lifestyle choice, even when science says otherwise"; or because they are personally invested in the concept that single parenthood is a perfectly fine choice due to personal or ideological reasons.
As such, I'd like some sort of policy guideline on answers which are rooted in the "being a single parents may cause parenting downsides" idea.