I've seen some good takes on this website before, e.g.
Tiananmen Square massacre is a myth; all we’re remembering are British lies
Wikileaks: no bloodshed inside Tiananmen Square, cables claim
Workers World: China’s Tiananmen Square
Tiananmen Square ‘massacre’ was a myth
What really happened at Tiananmen?
West hypes false Tiananmen death toll
The original fake news: Tiananmen Square massacre
The defeat of counter-revolution in China
WikiLeaks - LATIN AMERICAN DIPLOMAT EYEWITNESS ACCOUNT OF JUNE 3-4 EVENTS ON TIANANMEN SQUARE (1989)
Richard Roth - There Was No "Tiananmen Square Massacre" (2009)
Yenica Cortes - Tiananmen Square and the threat of counterrevolution (2009)
Tiananmen - the massacre that wasn’t
No, 10,000 were not killed in China’s 1989 Tiananmen Crackdown (anti-Chinese source, but still!)
Deirdre Griswold - Tiananmen Square ‘massacre’ was a myth (2011)
I don't like to use per capita measures to decide how bad an event was. That's the same reasoning as the "actually if you account for the difference in population, Oct 7th was like 50 9/11's in one day" talking point. But it is important to point out that it was definitely not a massacre because the bulk of the civilian deaths that occurred only happened after skirmishes in which police and soldiers had also been killed. It wasn't unilateral which I think is a pretty important part of a massacre.
Well, I'm using "per-capita" in the sense of "how many people were roughly involved or proximal to the events". Not just "how many people live in that country", as well as only comparing like-for-like (city-wide protests) events, to try avoid that kind of reasoning.