If it wasn't clear before Paris, it should be clear now. Civilization's battle with extreme Islam is not a war in the usual sense.
Think of it as if we are homeowners and they are termites, or we are a patient and they are streptococci, or maybe we are farmers and they are locusts. The answer to all of these is identical: extermination. It is time to call in the equivalent of Terminix or Orkin, and eliminate the pests.
You don't negotiate with termites, or streptococci, you kill them, as many as you can, as fast as you can. In both cases there is collateral damage, good insects or microorganisms get killed too. That comes with the territory - do it or die, the choice is ours.
Our President needs to lead, follow, or get out of the way. He's proven he won't lead, there's nobody to follow, so getting out of the way is what remains, maybe Joe Biden can grow a pair.
