In a situation where the two sides' strengths are completely disproportionate, the initial hostility from Zhou Tian towards the Blood Moon Lord due to the latter's improper actions doesn't have much impact. However, as Zhou Tian began to grow, the Blood Moon Lord felt an increasing pressure due to the proximity of his territory to Zhou Tian's and the vast gap in their powers.
A boss's authority means that even if the Blood Moon Lord's actions lead to the destruction of the entire clan, no minor monster can object. Even if they know it will lead to certain death, those monsters can only obey his commands.
Nevertheless, among the Pope level powers, quite a few monsters have gained a certain level of intelligence. Their intelligence allows them to clearly understand the situation on the continent. It's precisely the pressure from Zhou Tian that instigated many Blood Moon monsters to complain about the Blood Moon Lord.