When China invaded in 1950, it was illegal and the current occupation of Tibet by China is also illegal. China have no right to be there.
At the time of the invasion, and even still today, Tibet had its own distinct and unique national identity. Tibet has its own flag, national anthem, currency, army, postal system etc. Tibet has a completely different culture to that of China.
Tibetans are completely opposed to China’s illegal occupation of Tibet and China is causing war and deaths in Tibet as well as distress to Tibetans. China is getting a bad image from the world and should stop illegally occupying Tibetan land that doesn’t belong to them.