1) terrorist organizations do not achieve their stated political goals by attacking civilians; 2) terrorist organizations never use terrorism as a last resort and seldeom seize opportunities to become productive nonviolent political parties; 3) terrorist organizations reflexively reject compromise proposals offering significant policy concessions by the target government; 4) terrorist organizations have protean political platforms; 5) terrorist organizations generally carry out anonymous attacks, precluding target countries from making policy concessions; 6) terrorist organizations with identical political platforms routinely attack each other more than their mutally professed enemy; and 7) terrorist organizations resist disbanding when they consistently fail to achieve their political platforms or when their stated political grievances have been resolved..."

These claims are false. The IRA, the PLO, Hezbollah, and Hamas, who are AFAIK the prototypical terrorist organizations, aren't described by any of them except sometimes point 6. (Correct me if I'm wrong; I'm not an expert.)

Let's stop pretending that terrorism doesn't work. Do you think England would ever have talked with the IRA, or that Israel would have given territory to the Palestinians, if not for terrorism?