The governments job is to provide infrastructure and defense and that’s it. It’s societies obligation to shape society. Let’s leave the state out of it.
The governments job is to pass and enforce laws we deem to be just and in our particular case, within the scope of powers we have granted government at various levels. I expect my state and municipality to pass traffic laws but not to build nuclear subs. I expect the fed to stay within its enumerated powers and not redefine marriage because they want to. I expect the state to pass laws concerning marriage, children and divorce and not the fed.
I also expect our laws to discourage bad behavior, encourage good behavior and remain neutral when good and bad are not so clear cut and largely benign. Marriage is not a benign institution and critical to the survival of society - unless you want the state raising children and commanding their production. I know you don’t but the left does, at for those they consider their inferiors.