There is a common ethical perspective when dealing with laws like this, such as child support. What is best for the child? Should the child have a right to know

There is a common ethical perspective when dealing with laws like this, such as child support. What is best for the child? Should the child have a right to know who their biological parents are, or should the preferences of the parents decide that. If we determine that children are better of having such rights then the wishes of the parents tend to be disregarded, with some exceptions to religion which still supersede such ethical considerations.