I guess that one thing this thread has shown is that there are a number of possible additions that could be added to Civ4 along the general "terrorist" (used loosely) line, including terrorists, freedom fighters, guerillas, separatists, and so on...
Some of these can be state-sponsored, or intentionally act towards the same goals as a particular civ. Others merely cause random chaos. Thus it seems appropriate that these be represented in a variety of ways, some controlled directly by the player, some controlled only partially by the player, and some that occur entirely at random. And whilst Guerillas might best be represented as a player-controlled unit, terrorism might be better represented by random destruction in cities that is not controlled by any player at all - it is simply more likely with certain governments, happiness levels and so on...
Which means that a lot of the wide variety of options suggested in this thread, and perhaps others besides, could (and in my opinion should) be used together.
Some of these can be state-sponsored, or intentionally act towards the same goals as a particular civ. Others merely cause random chaos. Thus it seems appropriate that these be represented in a variety of ways, some controlled directly by the player, some controlled only partially by the player, and some that occur entirely at random. And whilst Guerillas might best be represented as a player-controlled unit, terrorism might be better represented by random destruction in cities that is not controlled by any player at all - it is simply more likely with certain governments, happiness levels and so on...
Which means that a lot of the wide variety of options suggested in this thread, and perhaps others besides, could (and in my opinion should) be used together.