Unfortunately you lost the right to force laws upon your citizens when you sold the same citizens to the Elves. You don't have any Imperial "authority" anymore, not anywhere outside of Cyrodill.
Stormcloaks are just a rebellion twenty six years too late. Fighting against the established political system, over a temporary and poorly enforced law. How long until the next rebellion and the one after that? Bringing back the old traditions, when those traditions failed is the sign of a short term thinker. How long will a King last when you can challenge them anytime.
You spread racial tension, and often mistrust and hatred. Where even Orc Strongholds are now "an affront to my people" your leader unwilling to even rule his Hold effectively, now tries to claim the throne of the country.
The Empire does have authority, and Ulfric can't risk all out war with Cyrodiil.
Yes Ulfric killed the High king... He didn't murder him. He is being accused of murdering the High king when in fact Torygg agreed in Nordic traditions to fight Ulfric. Had he rejected Ulfric would of had used it to summon the moot to declare a new High king.
Ulfric claims that he has lots of witnesses that can back him up, and to prove his innocence.
He stands accused of High Treason, no where in the law does it say it had to be murder. He killed High King Torygg, thus harming him. Punishment is death.
