Zhou Tian clearly understood that principle, but at the time he had other considerations. So, even though he understood that having a few years to buffer would be beneficial, Zhou Tian ultimately still intended to hurriedly carry out the next action.
Because Zhou Tian was well aware, according to his plan, he definitely needed to continuously rob multiple divine cities. Based on his actions at the time, offending a few true gods at most and robbing the divine city forces would surely not let it go. But those divine cities that weren't harmed probably wouldn't take Zhou Tian too seriously.
After all, if it doesn't concern them, why bother? Anyway, they didn't suffer losses at the time, and besides, Zhou Tian's strength wasn't weak. Without necessity, those divine city forces naturally wouldn't want to offend Zhou Tian.