In real life that may be true. But not in a game. In a game you want to leave the thorn there, so you have something to fight later. If you keep destroying everyone, and making the were not fun, then players will leave them you won't have anyone to play with anymore.
As far as Sirion goes, they won't fight Perdan now. With Csligus out, the war is over.
That's a very negative view of the situation. Players need to have thicker skin and learn to communicate and fight back in game... instead of coming on these forums and whining about so and so being a realm killer an such. Honestly, players take these things to personal, its a game have fun, if you dislike it be a charismatic leader and make changes.
Caligus issue is they are highly disorganized, lacking leadership, and not stable (plus can do little more than sit in their capital). Also, they refused terms which of course were not completely in their favor, but would helped them into a better situation than they are in currently. Everyone wants to fight to the death instead of take terms, in that case it cannot be helped
