Flipside, your veiw is slightly skewed because of your employment, in point of fact most(probably greater than 95%) of Families aren't like that.
IMO, in the situations you outlined, the children should be removed and given to a more stable couple, not a single parent, a monogamous, heterosexual couple. Children, boys in particular, need Fathers.
I loathe what the "Women's Liberation" is trying to do to the traditional, Nuclear Family. They are telling women that they don't need men to live a happy and fulfilled life, but every married woman I've ever talked to says they are happier now than they ever were before they wed. This is why you date for more than a year before
considering marriage, so you know what you are getting before you sign such a permanent agreement.
Sorry, I seem to have run off at the mouth again.
