As Egypt lurches towards the end of Hosni Mubarak's regime, one way or another - by "an orderly transition to democratic rule" (as Hillary Clinton delicately puts it), through violent overthrow or simply through the demise of the ailing 82-year-old president - much is unclear. One thing that should not be is that the Muslim Brotherhood is our enemy, and whatever role it plays in Egypt's future will be to our detriment.