At the time, making the living beings of a race abandon their originally cultivated power to practice the Warlock occupation he created should have been extremely difficult. After all, it wasn't just a habit problem; the disturbance caused by that young man was enough to make most races keep their distance from the occupation of Warlock.
However, even though Zhou Tian wanted to promote the Warlock occupation under normal circumstances, it was an extremely difficult task. After Warlock had been deemed a demonic occupation, merely mentioning Zhou Tian's intention to promote Warlock would likely immediately turn most living beings against him. Therefore, given the circumstances at the time, if Zhou Tian wanted to avoid courting displeasure, he shouldn't have spoken those words in front of those living beings.
