Negotiations are not needed to isolate terrorists. The vast majority of citizens will abhor violence as they simply desire a quiet life in which they can make a peaceful living. The best way for the government to isolate the terrorists is to ensure the security of the community and meet some of their grievances. When the community sees that they government is in a better position to provide what they want they will support the government. The situation in Iraq was unusual in that there were important people in the community who at one point or another actively supported Al Qaeda so there needed to be negotiations with these people. In most circumstances the important members of the community are on the sidelines so negotiating with them would not be analogous to negotiating with terrorists.