I understand your concern. Here is how I look at it.....I had a great childhood, have never been abused, neglected, beaten. But, this is not true for everyone. Many women who have had very rough or abusive childhoods or current situations will turn to drugs as an escape. In fact, most women who do abuse drugs do have history of abuse (physical, sexual, emotional). It doesn't make it okay, but I do find it easier to have compassion. Remember, also, that addiction is a phenomenon of great power.
Too, many of these women have a great deal of guilt about their drug use during pregnancy and they fear judgement from health care professionals. In addition, they may fear loss of custody. It is the nurse's responsibility to make possible a therapeutic, trusting relationship. We can't help a mom with substance abuse problems in any way if she doesn't feel she is able to trust.