First and foremost, you're probably looking at a major free speech concern the second something is listed incorrectly. You've got to quantify partial truths, exaggerations, etc. You've got to be able to fully reference the fact checkers themselves and on top of that you've got to monitor their sources for accuracy that could later change things. Verified vs unverified info gets crazy with journalist using anonymous sources or protecting their sources. Others, such as leaked info from inside an organization that leaves no means of actually fact checking it becomes even crazier.
Then you take a historical topic that requires a lot of study and context to fully understand what a statement on the subject even means and that's left to the devices/spare time of the people who are supposed to be doing it.
Distinctly complicated road to hoe.