We'll have to disagree on this one.  There is nothing more beneficial to a child than being raised in a loving household by the two people who created him/her.  To intentionally create a child to be raised without a mother or a father or to be taken away from the man/woman who created him/her is tantamount to child abuse.  Oh, sure, very rich people can buy a sense of normality in such situations, but the more common scenario is the struggling single mom in the city struggling to put food on the table.  

Just because some people manage to get along having been raised by a single parent does not mean that society should adopt this situation as admirable or advised; it's a catastrophe, and God bless those who survive it.