I posted on the thread linked to above.
Nooka, when phrased in the language you have chosen it is easy to see why it can be viewed as negative.
Typically, single mothers using sperm banks will be in their late 30s/early 40s, financially secure and, as is often the case, intelligent to boot.
Most don't see it as 'giving up on finding a man' but rather, refusing to tolerate behaviour from a man that would ultimately lead to unhappiness and stress further down the line. Many get to a point where we realise we either need to find a man in the next six to twelve months or make a positive decision to have a child alone.
Having two parents is better than one if both parents are loving, involved, dedicated, positive role models and care and provide equally. That's the environment I grew up in (for the most part, at any rate!)
Two parents is not better than one if one parent is verbally, physically, sexually or financially abusing the other.
Two parents is not better than one is one parent is disinterested and uncaring.
Two parents is not better than one if both parents are more interested in their relationship with one another than their children.
Two parents is not better than one if they allow the child to grow up in filth and squalor, if they do not attempt to take the children to the park, the zoo, the beach.
The unfortunate fact (for a country with such a high divorce rate) is that being in a bad relationship is distressing for the children while it's happening and upsetting if it breaks down altogether.
By contrast, one parent might be one parent, but she can provide the all important stability, love and support a child needs during their formative years. As I said on the other thread, I don't doubt some children will feel a strange sense of identify as they grow but it does not follow that all will and in any case, many of the 'issues' people mention are a concern about the choice - Sarah aged 19 who has a one night stand which results in pregnancy is told in comforting tones not to worry, you'll be a great mum and have you looked on entitled.to? Mary aged 37who plans to visit a sperm bank, is told she is depriving her child of his genetic heritage.
Really, a lot of this is the simple twenty first century fact that families don't all look the same and all that truly matters is that children are loved and well cared for regardless of the number of people doing the caring or the sex of the people providing it!