I hope that regardless of what happens during the dance we can all agree viserys is ultimately at fault for the war.

Everyone saw that a succession crisis would happen including him but he just denied reality and wasted all his chances to do literally anything. He missed his chance to join the black and green family lines together with marriage because alicent didnt want to even though the decision was ultimately his. He gave otto whom he previously dismissed for undermining rhaenyra the position of hand of the king while his health was failing and couldn't rule again whilst rhaenyra was far away from the throne. He was the king and had the most agency to prevent the war but didn't.