> And yes, this is very much my business, because how you raise your children dictates what kind of society my children will live in, so please raise them right.

Sure, but I'd like to see if your conjecture is actually backed up by the evidence. I too might be initially inclined to believe that monogamous partners are better for childcare, but I'm guessing that I am also epistemically biased towards that assumption, just as a product of the societal norms I've grown up with.