Yes, eye witness accounts. Thousands of families whose children never came home. Widely available photos online. The smoking gun that you aren’t allowed to talk about it.
I have talked to people who saw it. Similar to how we can still talk to holocaust survivors. Maybe they are all lying. But the motive seems unclear and the testimonies are corroborated by others.
That's also against the site guidelines, and actually worse than the GP provocation I replied to, because two piling on is already the seed of a mob. We don't want that dynamic on HN at all. If you'd please review https://news.ycombinator.com/newsguidelines.html and stick to the rules when posting here, we'd appreciate it.
Any criticism of Xi at all will suffice. And there is mountains of evidence about the thousands of innocent protesters that died that day, despite the attempts of an authoritarian government to prevent the truth from being known.