Negotiation implies rationality. Islamo-fascists are totally insane and must be obliterated.
Fanciful concepts that apply to "civilized factions" have no relevance. Other notions like "strategic symmetry" that describe insane annhilation are useless.
Criminality on the scale of Islamo-terrorism deserves commensurate total and final elimination with not one iota of negotiation. The fact of this response can be the only deterrent if anything can be.
ADD: The "golden chain" is the key fact that drives this issue.