Why would it be a bad thing to have fact checking?

I believe right now it is because so many worldwide have been brainwashed into following herd mentality. Look at what DuPont did. People are quick to forget things.

Yes, and I do think a system like they have that only allows something to be approved when people who have different perspectives agree is a good idea. See https://github.com/twitter/communitynotes/tree/main/sourcecode Also, I believe it is labeled correctly. It is a “note” which doesn’t imply it is a correction which I think is important.