I think this is an inherent issue - I could keep generating casual spot-check problems like that for weeks if I had the time to do so, the scope of human history is large enough that this sort of auto-processing will always produce these levels of errors. You do need historians to do history!
I also think there are some even more fundamental issues with the data-vis, though - ways that this events-and-civilisations model distorts our understanding of the past more than supporting it.




