Well Fort Condor being taken out is more of the rebels fault since they are holed up there to save an endangered species over the whole damn planet, and no one said Shin-Ra weren't being jerks about all of this. Besides, the party doesn't even realize that Corel is in danger until they get there (meaning they were their to thwart them anyway without the destruction of Corel as an incentive) so I still feel the party is being illogical.