We don’t, but it is likely someone just misconfigured a file somewhere at microsoft. All the search providers that operate in china are not allowed to show any of those pictures or talk about Tianamen square in any terms, other than it was a terrorist activity by potential rogue states that was put down by the army… and that’s the MOST you’ll get. Most times you’ll just get rosy photographs of the square and flowers and a few statues here and there.
If you were to travel to China and search for “Tank Man” or “Tinanmen square”, as one of my coworkers did, you’ll get an extra special meeting with some people who will then escort you to the airport, put you on a plane, and fly you home. Your luggage will arrive two to six weeks later, but I would suggest throwing away any electronics you had. We picked out bugs in his laptop and cellphone.