As Buddhists, what do you make out of the tragedy of Tibet?

I finished watching two movies on the life of H.H the Dalai Lama (Kundun and Seven years in Tibet ) which also highlight the tragedy of Tibet. Historically Tibet can be said as the only country which has dedicated itself to the attainment of Nibbana (take this with a pinch of salt). A huge amount of cultural heritage and Buddhist documents must have been lost during the cultural revolution. So what do you make out of the tragedy of Tibet? Do we learn any lessons about Karma? Do you think that for protection of Dhamma Tibet should have indulged in dealing with arms? If you are a Vajrayana, do you care for Liberation of Tibet? ***P.S: Not being judgemental towards the Chinese.***