Eta Gives Up Violence

Eta, the Basque separatist movement in Spain / France has decided to give up violence.

How much of their decision, like that of the IRA in Great Britain, is due to the dramatic change in public sentiment toward political violence since the September 11 attacks? How much is due to their dwindling numbers?

More importantly, how do we decide what constitutes a "Terrorist", and what constitutes "Freedom Fighters." I'm sure that new movie, V for Vendetta, will clear everything up.