Việt Nam has already had some massive Catholic demonstrations in Hà Nội itself. They were repressed but without nearly the violence of Tien An Men. Some people went to jail and the people were horrified that two or three individuals died, at least one of them accidentally. The government said little about it and individual officials apologized quietly. They are Vietnamese, not Chinese, a very different thing. If you are intnerested watch the you tube Lecture series on the History of Việt Nam by Professor Stephen Young
HERE. you will find out who the Vietnamese really are. They in some respects are much more like Americans in cultural attitudes than are any other Asians. They are individualists.
I know something of the area and people, though I’m far from an expert. I know Ho Chi Minh wanted the freedoms discussed at Versailles in 1919, and tried to get them there. North Vietnam and the Viet Minh turned to communist governments for help because the Western democracies wouldn’t cross France, but today they still have no use for democratic ideals.