Song Jiang certainly wouldn't want to go to Jiepen Country! To say nothing of Song Jiang, most people wouldn't want to go; who would willingly go to a foreign land for no reason?
Yet weren't the Heroes of Liangshan at their wit's end? They had very few options left: either be completely devoured by Emperor Huizong's court from top to bottom, or fight to the death with everything they had. There was no third choice.
Consequently, Mufeng needed to shatter their illusions first. They thought that after accepting the amnesty, they could risk their lives for the country and achieve greatness, but Mufeng was going to place the bloody reality right before them. He would tell them that when the world became like this, the ultimate culprit was always the emperor, not the treacherous ministers they imagined.
Chapter 323