The goal is to move society — in this case, away from a safe environment for children.
In the marriage debate, people frequently argue that how one chooses to define marriage doesn’t affect other people’s definitions of marriage, and because my definition is as good as yours, it should also be promoted by society.
Many times it is stated: “What I choose to do in my marriage doesn’t affect your marriage.” However, same-sex marriage affects all of our marriages.
First, to explain, private actions have public effects. All our actions, both private and public, define our identity. Being human, we are motivated to impart our identity to future generations. As we have seen, and understandably so, people in homosexual relationships are trying to change society to more readily embrace and promote their view of their identity. This is possible largely due to the disassociation between sexual relationships and procreation.
In contrast, there are many who have not disassociated sex and children, and for reasons both secular and religious have incorporated heterosexual relationships into their identity. These people have generally been trying to live up to the ideal that marriage was established millennia ago to promote the raising of children in safe environments supported by their biological parents.
Sadly, we don’t always live up to this ideal, and most have experienced the trauma caused by a breaking family. However, we know of marriages that practically achieve the ideal, and we see the happiness that children find in a supportive family structure. Even though some traditional families are breaking, it doesn’t mean the ideal of traditional marriage is broken.