Here it is although some of it may be out of context due to it being only my side of the messages and two different ones as well.
Exactly why I brought up the Gothic Wars. They were essentially started because the Goths felt abandoned by their saviors the Romans.
Now the Empire has one of two things they can do in this scenario:
1. Attempt a treaty of peace between the Empire and the Storm-Cloaks. This would upset the Thalmor for they were the ones behind the whole idea of persecuting Skyrim, I believe it may have something to do with the Great War and the whole Elven/Nord tension that seems to run deep in both parties. Now if the Thalmor get upset and reignite hostilities with the Empire they are done for, except for this time they won't be allowed to surrender. Even with a treaty with Ulfric this is not enough for the Empire to turn around and punch the Thalmor in the face.
They way I see it is the Thalmor essentially have a gun to the Empires head. If the Empire does as their told the Thalmor let them live, but if the Empire tries to stand against them they will go back to war. A war mind you that the Empire could not win with a full military force, and now they barely have that because the Thalmor will not let them rebuild their military. For if they rebuild their military they can attempt to take out the Thalmor. So the Thalmor are controlling the Empire with the intention of tearing apart everything the Empire has left by making them look like a weak puppet state, and the Empire can't do anything about this because it would mean the end of themselves and everyone else.
2. The Empire can go to war against Ulfric eliminating the issue and doing what the Thalmor want them to do. Of course the Empire does not want to do this, they have no quarrel with Skyrim. But it comes back to if they do not do what they are told to do by the Thalmor they themselves will be destroyed. It is a very complex battle of survival that honestly the Empire has very little say in.
I see the Thalmor as a parasite, if you let them attach themselves to you, they will control you turning your body against you and if left untreated killing you. But if you try and wrench it out you may very well kill yourself in the process. So it is best if it never attaches itself in the first place, unfortunately a great nation is doomed to die a terrible death unless they are helped by other nations that see the real enemy is the Thalmor and the Empire is helplessly controlled by them.
So the Thalmor is attached to the Empire so they are not a threat to anyone else at the moment. But if the Empire dies then the Thalmor will move on to the next host repeating the cycle until no one opposes them. The Empire was the strongest military power in the world but now they are not. It would take everyone to kill the Thalmor, that is why the Empire is trying to hold out and keep them stuck in a political limbo. Giving other nations a chance to build up and take the fight back to the Thalmor giving the Empire room to breathe so they can help as well. If the Empire is destroyed the Thalmor no longer have a reason to stay in one place and deal with one entity they can then move onto the next one so to speak.