and what MORAL right does an activist have to insist that the baker violate his Christian principles

Huh? Surely the whole point is that the baker did not violate his Christian principles. He decided that his principles were more important than the law of the land and paid the price for doing so. Just as other extremists do.

What moral right does a Christian fundamentalist pressure group have to insist that two people who love each other should not be married or that a raped girl must have the child that no-one wants? You really need to choose your terms carefully Pete when looking at a case involving the Christian Institute.