What both parties care about cannot be placed on the same level; Tia cares about everything, while Zheng Yichen cares about Tianhe.
Although Tianhe is also part of the World, part of everything, in Tia's eyes, Tianhe is illegal, an existence that brings blemishes to the New World.
As for the New World people, Zheng Yichen bears no hostility towards them, but it's different for the War Hundred Clans involved in the Tianhe operations.
Wars triggered by greed cannot end simply because one side wishes to stop.
The War Hundred Clans' coveting of Tianhe is related to Tia, absolutely related, but the largest relation isn't that Tia instigated the War Hundred Clans.
She doesn't need to instigate, nor does she need to directly interfere with anything; even as an observer, such wars would happen; the most significant relation between the war and her is that Tianhe was frozen more than two hundred years ago.
