undertheradar: Why is the biological father of this child not being held responsible to support her?
There may be circumstances that stop him from doing so. Remember, this is a young man who was disfellowshipped and has no contact with his parents. For all we know, he could be suffering from mental health issues and unable to work.
undertheradar: Why should the public support this child when the father should be doing so?
Who says "the public" is supporting the child? I may have missed it, but I don't remember reading anything about the child being supported by the public. Is this an assumption based upon a stereoptypical view of single motherhood?
People should not be allowed to get away with fathering or having children they cannot support.
If that were the case, probably many of us wouldn't have been born.