I am all for supporting the rights of the individual. I believe that the right to do what we want should not be overridden unless it harms another. If this couple was not going to conceive a child then I would support them. It may not be the norm, but they deserve to do what they want. The fact a child could be brought into an unstable/shortened marriage where it could hinder that child’s development makes me want to limit that relationship.
They have the right to be together, but they should not be allowed to harm a child like that.
Until they can prove to me that the relationship will not harm the development of the child they should be barred from conception.