One problem with naming your enemy is then you are giving him a chance to change his name and claim you are fighting the wrong person. Make the identification and then deal with the personage. Are we at war with Al Qaeda or Hamas? Hizbollah or Radical Freakin' Islamophobes wherever they may roam? Our vacillating and faintheartedness is just seen as a sign of our decline by Iran, Syria Saudi-Arabia, Pakistan, Afghanistan etc. The defeatists in our midst will even try to go legalistically, suicidally, insanely, querelous on US and may even get US all killed.
The U.S. is the only force keeping all these rogues in line. US and our petro-dollars.