Hore (2014) says that Tibetans have suffered more than any other nationality from Chinese rule
In 1959 the Chinese army occupied the whole country imposing "military administration and partition." Some 50,000 fled to India including the Dalai Lama, the political and spiritual leader.
Since then Tibet has been ruled "essentially as a colony." It suffered in particular during the Cultural Revolution. Monks were beaten or killed. Temples and monasteries were destroyed. And "age old artworks" were thrown on the fire (Westad 2017).
There were also economic disasters. The Chinese insisted on planting winter wheat instead of traditional barley. Crop failures and food shortages followed.
There have been uprisings including riots in Lhasa in October '87 and March '88. However a strong military presence and an increasing Chinese population has kept the cap on unrest.
Before the Chinese occupation Tibet was, Hore (2014) reflects, "far from paradise on earth" with the peasantry exploited by a feudal elite.
Yet most Tibetans remain poor. One brutal ruling class has been replaced by another even more brutal, better armed one.