Just ignore all rules of logic, common sense, and law when you have the power to get your way anyway. Then when you're on the weaker side, complain bitterly that the stronger party isn't treating you fairly. If the best you can do is accuse your opponent of being pragmatic (in dealing with your patent absurdity) then you say they're just like you.

I'm reminded of the Lawyer's Primer -- http://thinkexist.co...w-you/178736.html : "If you don't have the law, you argue the facts; if you don't have the facts, you argue the law; if you have neither the facts nor the law, then you argue the Constitution." But they missed the last step, beautifully laid out in the ice cream scene from Thank You For Smoking -- http://www.youtube.c...tch?v=zLS-npemQYQ -- which could be summed up as, "When you have neither the facts, the law nor the Constitution, argue your opponents motives."