I have never grasped this whole chemical weapons red line thing. Maybe someone could help me see it in a new way. 

Serious question: How is blowing up men, women, and children, letting them bleed to death, or be trapped/crushed in their apartment buildings to die more 'humane' than poison gas? Why does al-Assad get a pass from the international community (and yesterday Donald Trump) for bombs and bullets, but not gas?