Even though everyone suspected Qiu Tu had an ace up his sleeve, when that ace was revealed, the high-ups of every human sanctuary went completely nuts.
Allying with the Evil God, joining the evil god organization, conducting secret human experiments, selling out human intel, dragging other factions into the mess—any one of those acts is a major offense.
Together, they're simply unforgivable crimes.
That's why Qiu Tu and Princess Xi raided the Zhao family and executed all its members; Tang Feifei, Rain Butterfly, and Guan Xiao oversaw the shooting of the Han family members by the elders and family heads at Sanctuary 7.
As for why it was Princess Xi who executed the Zhao family's members, while the other elders and family heads executed the Han family's members, there's a reason for that too.
The Zhao family inherited the Lin Family's "Butterfly Gu," and kept digging deeper in their research. In a way, they're Princess Xi's enemies.
