Mary Ellen O'Connell : Apparently producing conclusive evidence to link the regime of Syrian President Bashar al-Assad to the use of chemical weapons against the nation 's citizens may not matter either . U.S. says U.N. approval wo n't affect plans for response to terrorism . She says ignoring international law , facts can cause tragic events such as Iraq War . O'Connell : Obama right to denounce chemical weapons , should n't be outside UN approval .
Mary Ellen O'Connell : U.S. says U.N. approval wo n't affect plans for response to terrorism . She says ignoring international law , facts can cause tragic events such as Iraq War . O'Connell : Obama right to denounce chemical weapons , should n't be outside UN approval .