When somebody slowly comes out from dark to light, others would naturally follow suit.
Ambitious forces couldn't help themselves when they saw someone else benefit from the wreckage.
When hungry wolf packs catch the scent of blood, they wouldn't easily give up.
The powerful nobles and guilds cunningly seized and occupied various assets of the sect.
Even if the sect's followers wanted to resist, they couldn't do it without the support of the gods. So, the nobles and guilds acted without restraint. They rushed forward like starving sharks.
They delighted in feasting upon the remains of the sect. The immense benefits even lead to conflicts and wars among various factions.
The already chaotic situation becomes even more turbulent.
The looting of the sects gradually ended not because the major forces suddenly grew a conscience, but because the high-quality resources of the sects had been completely devoured.