As for Uighurs, they're thriving and developing most rapidly in Xinjiang province, while the Western-backed extremist are indeed no more, exiled to their sponsors. Of course, the West has no problem sponsoring extremists, be it Nazis in Ukraine, Isis (and White Helmets) in Syria, rightwing death squads in the Americas, etc.

In the case of Tiananmen, that was an early colour revolution that got rightly squashed, demonstrating the need for strong government against foreign interventions that China is no stranger to since the 1800s regarding Japan and the West.

Almost forgot to mention, North Korea was bombed almost to oblivion until the USA literally ran out of bombs. Speaks for itself. .