The last sentence of my previous post can be read with an unintended note of false bravado.
Just to be clear, I didn't mean to imply that, on this matter, here I stand, with banner unfurl'd, undaunted in the face of the foe, and fie on the shouting horde who would undo me, for I tremble not nor fear before them.
What I meant to imply is that moral principles can have political implications, and that unwanted political implications do not in and of themselves invalidate the moral principles that imply them.
I have seen arguments proposing that, when a moral principle implies a political position contrary to an already-held political position, the moral principle must be, if not abandoned, then reinterpreted until it has no contrary implications. Any argument that makes a political position more fundamental than a moral principle is unsound.