The Thearchs and Sacred Kings looked at each other when they heard Zatiel's words. They were not surprised by the brutality of his actions since while the Daybreak Universe was a utopia, he built it over the bones of countless evil races that would not follow his lead.
What affected the mind of the Thearchs and Sacred Kings was that Zatiel was asking them to follow the path of Endless Darkness.
Although, unlike the Beyonder's Knight, they would not fall into mindless deprivation, enslaving the entire universe so his master could consume it along with all its life forms, they were still taking control over and willing to use force.
Nevertheless, while that behavior was not something that they felt comfortable with, there was no price high enough they were unwilling to pay when it came to the safety of the life forms of the Daybreak Universe.