Titus Mede II had to make a ballsy move when The Thalmor came to him demanding he surrender to them
He could
- Accept immediately and probably cause a massive civil war throughout the Empire that could have brought it to a state of nonexistence
- Fight a war he knew he probably couldn't win, due to The Empire's already fractured state, but possibly keep The Empire together
He chose the war and eventually stalemated The Thalmor, and yes I say stalemated because after the Battle of the Red Ring both sides were terribly whipped and neither side had the ability to continue. At that point he had to make another REALLY hard choice, he could eaither
- Continue to fight a stalemated war for possibly years upon years until the point in which one sides people eventually crack under the pressue of it all and revolt possibly destroying both sides completely
- "Surrender" to The Thalmor and give The Empire the chance to rebuild so it can take on The Thalmor later with renewed vigor, with the consequence of a lot of his people hating him.
Now some would say he should have continued the fight but I must point out after the Battle of The Red Ring both armies were nearly annihilated and most of the cities in Cydroill were burning or had been destroyed, however The Thalmor's lands were by comparison in much better shape giving them an advantage in resources.
Attacking into Valenwood or Elsweyr to get the Alinor, as attacking and taking Alinor would be the only way to get The Thalmor to fully stop, with Cyrdoill in its current state would have been disastrous and would have cost Titus Mede the rest of this soldiers and possibly The Empire, and there was simply no way to both rebuild Cyrodill and continue the fight through Valenwood and Elseywer at the same time.
Now we get to the Hammerfell "betrayal". The Redguards of Hammerfell are steeped in a ancient tradition of fighting, to the point they literally destroyed their original homeland with it. The Empire's surrender would have been the most un-Redguard thing to do, and as such the Reguards continued to fight, as is their tradition, even after the war was "over". Their ways threatened Titus's plans to rebuild The Empire and so he had to let them go.
Some might say him doing so was unfair, or that he was leaving them to death, but I must remind everyone here that The Redguards were known as the best fighters in all of Tamriel. I don't believe Titus "abandoned" them, in fact I think he knew very well they might drive The Thalmor from their lands and hoped they would. However while any progress against The Thalmor is appreciated the simple fact was that neither he nor the Reguards could take the fight to The Thalmor yet, nor could he fight them with Cyrodil in such a state, and that was what needed to happen to truly win.
Furthermore I think Titus believed that once The Empire had rebuilt sufficiently and started the renewed attack against The Thalmor, that the Reguards, regardless of The Empire throwing them out would help them as a way to get revenge against how poorly the Thalmor treated The Redguards during the occupation. The Redguards may not like The Empire to the point they may never rejoin it, but they dislike The Thalmor more and that is what mattered. I believe Titus was willing to lose a province, permanently, but still have the possibility of them helping The Empire, to win the war.
While Titus may have allowed the persecution of his people at the hands of the Thalmor due to the signing of the WGC, I do believe he knew WTF he was doing, and made many calculated moves to keep his [censored] together.
Were may of them unfair? yes Were many of them unjust? yes
However Ulfirc's cause only weakens both Skyrim and The Empire, his ideals can only result in a Thalmor gain, while it isn't fair that the worship of Talos is banned, I think they just need to sit down, Please continue, my good sir., and deal with if for a little while longer so they can get rid of it.