Red line? Are you kidding? Why is it less moral for Syrian President Bashar Assad's forces to kill rebels and civilians by asphyxiating them using sarin gas than it is for them to blow off limbs or faces or send bullets into people's torsos?
The moral red line was crossed long ago; the sarin red line is about the politics associated with the risks of arming the enemies of our enemy and the risks of involvement in another Mideast war. The debate should always have been about this; instead, it's embroiled in a heated struggle to decide what, if anything, to do about the declared-to-be-crossed red line.
President Obama's warning that use of chemical weapons in Syria would prompt a U.S. response smacks of another flavor-of-the-month "moral" reason for the U.S. to insert itself into other nations' business.