Don't even start on the Markarth incident, my friend, because you're about to lose this one for even attempting to point the finger game at Ulfric
Skyrim:Forsworn - UESPWiki
“
Igmund, the son of the deposed Jarl, and the Imperial Empire, made a promise to Ulfric Stormcloak and a group of Nord militia in 4E 176 to allow free worship of Talos in exchange for putting down the rebellion and retaking the Reach. Igmund knew this promise was in direct violation of the White-Gold Concordat, but wagered the Thalmor would not discover it. Ulfric led a Nord militia against the Reachmen and used the Thu'um to shout them from the very walls of Markarth and then drove them from the city. Captured Reachmen were brutally tortured and executed by the Nords, with the few that were spared being imprisoned in Cidnha Mine.”
It goes on “The surviving Reachmen fled to the wilds of the Reach, creating what would become the Forsworn. Their leader,
Madanach, was secretly imprisoned in the
Cidhna Mine by
Thonar Silver-Blood in an attempt to leverage control over the Forsworn. When the Thalmor discovered the presence of Talos worship, they demanded the arrest of the Nord militia. Igmund was forced to arrest Ulfric and his men or risk outright war over religious conflict. The Nord militia were eventually allowed to leave, but Igmund's broken promise left a fissure that would eventually widen into the Stormcloak Rebellion. The Forsworn still remember the cruelty of the Nords who deposed them, and seek vengeance against all Nords as a result.”
Try to figure this one out.