As Buddha had taught, nothing is permanent. Yes China destroyed the monasteries during their invasion but had realised that to maintain harmony, she will need to elevate the people's living condition and the level of their spirituality. As such China invested millions into rebuilding Tibet, including places of religion. As spiritual teachings are guides to pure morality, China encourages religious freedom and do not tolerate religious persecution. The living condition of Tibetans are rising unlike the refugees living in camps under CTA's administration.
On the other hand, CTA hoards all the sponsorships and donations whilst dispensing only towards political support. They put a ban on the practise of enlightened Protector Dorje Shugden and accused him of being a "spirit". It may look benign but with the ban, CTA encouraged and supported acts of abuse, segregation, schism and depravation of medical care, schooling, jobs as well as financial support which the donations were intended for. Tibetan Shugden practitioners live in constant fear and Shugden Lamas were expelled from their monasteries where they had lived for most of their lives. The effects of the ban are going deeper into being a terrible threat to the pure lineage teachings and practises. So, Duhhh! What right do CTA and supporters have in complaining about China??