The purpose of the government is to secure our unalienable rights - among these is life. Another is the child"s natural right to have a mother and a father. Marriage is a contract between mother, father, and fellow citizens. The purpose of which is to delegate the responsibility of protecting the child's right to the parents. It also allows the citizens to hold the parents responsible jointly, thereby financially protecting (protecting the property rights of) the citizenry in general.
Fiscal Conservatism is inseparable from social conservatism.
You’ve raised some good points for discussion but I’m viewing the position as overreaching in the government’s role.
The problem could be that the founding fathers did not imagine society would get to the point it has. What would they say about it if they came back today to survey the situation?