If he couldn't accomplish this, then for the Sword Sect, it would lose its significance, and it would be hard to prevent other thoughts from arising within the Sword Sect.
So when the Jade Emperor's plotting came to light, Emperor Gouchen realized the situation he was in. He had to make some amends, at least put in some effort; otherwise, he would really leave a handle for others to grasp, causing many to be dissatisfied and inviting criticism.
"Your subordinate understands! I will spare no cost to prevent the Jade Emperor from obtaining the Great Law Decree Technique!" the War God of the South Pole assured with fervor.
He was a subordinate of Emperor Gouchen, and their relationship was such that they would share glory and disgrace together. If Emperor Gouchen's position was shaken, his interests would surely be damaged.