[CUnknown]

I think it may be the Secret Enemy thing.. people might not want to attack and risk themselves if they might end up losing the game even if Evil wins, because they never eliminated their Secret Enemy.

Also, Good is sort of forced to attack, given the set-up. From the perspective of Good, the map is a very unfriendly place.

Calling all Good and Neutral nations! We must oppose the Evil threat, or it will dominate this world. The time to act is now! Balance must be acheived, before Good is extinguished.