The logic is simple. Based on the Constitution, the SCOTUS should strike down un-Constitutional laws, whether they're made by the feds, the states or any other government.
I hold that the purpose of government is to protect the rights of the individual, and has no other legitimate purpose. The old Declaration of Independence thing.
Cities or counties or states have no more rights than you do. They get their powers from our consent. None of us want to be raped, murdered, robbed, defrauded, etc. It's very logical for us to band together and pay people to stop the knotheads who think those activities are acceptable. There's no individual right to rape or murder so we're violating no one's rights by our using government to stop those activities.
But two consenting homosexuals doing their (admittedly disgusting) thing in private are violating no one's rights. Therefore those of us who disapprove of this activity may not use government to stop it.
I don't want to be told how FAST I can drive either (on an open road) or how many cars I park in my yard, or how loud I play my music, too.......