Pete, It is that simple. These clerks who are denying gay people their civil rights are unlawfully discriminating against them regardless of their stated reason for doing so. To draw an analogy between their actions ,or inactions, and Rosa Parks defiance of Jim Crow laws is ludicrous. Again, she was fighting to expand civil rights and the people you champion are fighting to curb them. I'll also remind you that "traditional" marriage has been redefined many times over thousands of years. Look it up.
On a happier note I witnessed the wedding of our two closest friends, they happen to be gay, at the county courthouse last week and all the government folks shared in the joy of the occasion.