I'll bite.

The "thousands killed" part of Tiananmen has no credible source.

Thousands wounded? Sure. Killed? Around 500, maybe up to 800. The NSA, the NYT, Amnesty and a few others stay under 1k.

The US embassy reported "no bloodshed on the square itself" (the protests were larger, that doesnt deny all deaths). WaPo and CBS correspondents (and a Chilean diplomant stationed next to the square) observed no mass firing on the square either.

So, whats more likely? That they all lied? Just didnt hear the shots? Didnt pay attention? Or that some people overreacted to a government crackdown, that - while excessively brutal, definitely causing hundreds of deaths across the entire protest - is a lot less "massacre" than people with anti-china interests would like to believe?

Look at other incidents - initial deaths are always overreported. That blast in Beirut? People immediately jumped into the thousands. Some compared it to a nuke. Actual death toll? Around 200. (not including long term consequences of their main port being deleted by the blast ofc)