The president’s appearance on Jon Stewart’s “The Daily Show” has been well-covered for the statement “If four Americans get killed, that’s not optimal.” ........ What is less well publicized is the response of Ambassador Sean Smith’s mother, Pat Smith, to the president’s remark: “It’s insensitive to say my son is not very optimal — he is also very dead. I’ve not been ‘optimal’ since he died and the past few weeks have been pure hell.