It is a neccessary evil for several reasons. The greatest is health. How often are transplants needed? How often are genetic disorders passed down? It is better for the health and safety of a child to know who the biological father is, in case a situation like that arises.
Conversely, a man learning he isn't the father at that time, should be allowed off the hook then, but if he decides to stay with the mother, and the child, he can't let himself off the hook later. The argument is true. A man can't be the parent of a child, then 10 years later, say, oops, not mine, cya.
The DNA testing would accomplish the goals both sides claim to have. Child being supported, no fraud. If we had rationality in government, this would happen. Every kid deserves to know who is their father.
A new law to protect fathers from an old law. To mandate paternity tests at birth is to assume the mother is guilty. Neither you nor I would like any laws passed requiring us to prove our innocence. We should not require them of others. Two wrong laws don't make it right, just get rid of the old law.
It would seem so. But I think an unintended consequence would be an increase in abortion. This is a situation that requires the wisdom of Solomon.
Paternity testing is not cheap. A quick google search found prices ranging from $240 to $500. As a taxpayer, I don't want to pay for this for others, and I don't want to be forced into paying for this when I have no reason to doubt my wife.