AlteredEgo you have a viewpoint that is emotionallly charged and logically lacking.
I have children, and from you view i assume that you either do as well or are planning to.
I wont argue with emotional rants, (assuming) you are a woman, you are not biologically programmed to understand the Disgust and Anger a situation like this causes a man. therefore you will never "feel" deep down the disgust and rage this evokes in a man, simply because:
barring adoption, A woman will always raise her own child, and regardless of the father, that child will share 50% of her genetic material. It will be her child whether she is a single mother, whether she has the same dad or whether she is raising it with another man.
In a true nuclear family, both parents are raising a child that is 50% theirs genetically
If a man is raising his wives child who was impregnated by another man, he is raising a child that is 0% his genetically. he is raising two completely foreign peoples child. Even worse, he is convinced that it is his child so he will work, provide, defend and care for it as if it were his own, when in fact it has 0% relation to him. In a sense he has been genetically assassinated and replaced by a complete stranger without him knowing about it.
The only way a woman could experience this same nightmare would be if her baby was killed at birth without her knowing and she was given a complete strangers baby and was then tricked to think it was her own. would you still feel an obligation to raise that child if you found out about what happened 3 years in the future?