Thank God, eleven of the twelve Apostles, as well as who knows how many Holy Martyrs for the faith did not share that view. Our human ideas of acting, based on the success / failure ratio is not how Christians are commanded to live our lives.
It may be that the best thing that Christians can do, when confronted with a situation like this, is to become as inept as possible; never complete any action that violates conscience, and force their termination.
The argument I have heard about the primacy of the oath taken is weak; unless ipso facto you cede all power to the state.
I'm don't understand what you mean. Are you saying that Christians should not seek to have just laws passed, in spite of the opposition? Or are you saying that we should expect to achieve perfect justice in this world, rather than in the next? Or am I off track entirely?