Given that there's currently no way to truly kill Zhou Tian, considering Zhou Tian's potential, the group of Divine Kings wouldn't mind trying to dissolve their grievances with him a bit.
Although judging by their actions at the time, it seemed that Zhou Tian would certainly seek revenge against them. But even if Zhou Tian sought retaliation, it was unlikely that he would really let them off.
No matter what, the number of Divine Kings who attacked Zhou Tian at the time was considerable; even when most of the Divine Kings from the Divine Realm took action, it's unlikely that Zhou Tian could truly kill all the Divine Realm's Divine Kings!
