If Mo Han Shan was really still alive, then his act of mutilating the young children and throwing the corpses of the dead into the Guandi Temple this time was probably because he learned the news that Mo Qing Shan was in the capital, and was deliberately provoking him or the entire Momen.
Just because the former elder hated evil and disliked Mo Han Shan hateful heart, he couldn't bear to see him the way he was. He believed he was deeply responsible for Mo Han Shan's love, and was very annoyed at his self-indulgent practice of dark magic.
He warned him when he was imprisoned in Mozhuang. If he didn't face the darkness in him and think hard and change his ways, he would gouge out his eyes, so that he could no longer practice this magic art. But Mo Han Shan never changed.
Since Mo Sect was known as the number one sect in the world, and Mo Qing Shan was the highest in charge of Mo Sect and was highly respected, Lu Ziqing did not question his remarks.