Well let's see. Nation A attacks three nations during a war which are already at war with other nations. Alliance retaliates by sending reinforcements to attack the Nation A and backup their comrades. That's six nations at war with Nation A. Nation A realizes it is screwed and/or gets "bored" of the game (which is mainly what happens to rogues) and decides to go out with a bang. Nation A is now officially a rogue. Rogue sends out a nuke to the nations s/he is at war with every 3 days or so while continually buying more nukes. 6 nukes, 6 nations, 150 infra per = 900 infra damage per day to others through nukes alone, not counting CM's and airforce. Now, the defending/attacking nations are at a great disadvantage - they can only nuke the rogue once a day and only do 150 infra damage through nukes. I wouldn't exactly call that "fair" as one nation is greatly outnumbered, is putting up a fight, and doing more damage in return.
That of course was the last war. Now we have the SDI and spies so hopefully the game has become much more balanced since then. Unfortunately, there's only one way to find out - wait until the next Great War.