Once they calmed down from their crazy desires and ambition, even Bolet had cold sweat. It would be best if nothing had happened - they could only make the most appropriate choice. Moreover, with Wang Zheng's reminder, some details were questionable. For example, Bolet's spies amongst new humans had been too cooperative, and the cooperation felt intentional. Human Ability X users were unable to see through their thoughts as well, and based on the signs, it may have been an act.
Thinking back, since Lear could control the new humans to attack, their thinking could have been affected as well. This was the same characteristic of the Zerg, and he hid this from them from the start. Perhaps it was to delude himself.
Bolet was a typical Manalasuo citizen, very decisive. Lear could no longer stay. Manalasuo could not become the criminal of the whole of humanity. All of them had to be eliminated, and not a single one would be left alive. This was Bolet's attitude.