Why did Zhu Yuanzhang order Xu Da to kill all Shandong people?

Back in those days, when he was begging, he passed the Shandong border many times and was discriminated against. When he owned the whole world, he ordered the general Xu Da to attack Shandong, killing all men, women and children and giving him evil spirits. Since then, Shandong was once deserted and had to emigrate from other places. Now people in many places in Shandong ask their ancestors, and they will say it's far away.