Uhm... using your example of blacks and whites wanting to get married, it was people like this clerk who perpetuated and enforced that nonsense. She would have been the one refusing to issue a license to a mixed couple despite the fact that the law and the courts said you had to. As I said, she is in jail because she refuses to do her job as prescribed by law. If she wants to make a change, then let her either do it on her own time or get elected to a legislative position. It is not her job to decide who can get married and who can't. Her job is to issue the licenses and record the details in county records.
Don't disagree about having to get a marriage license in the first place or about the stupid disparities in taxes for two single individuals vs two married individuals or the tax breaks for kids.
Solve the whole mess by getting government out of the marriage issue completely. You want to get married, fine go to your church and if they allow it then let them perform the ceremony. Everything else is a civil union that any two people (M/F or same sex) can simply set up via POA, trusts, wills, etc.
With identical household income, two people living together but not married should be paying the same taxes as two people living together and married. If I have kids, that expense should be on me. They are children not tax write-offs.
And for the record I'm married and have three kids.