I agree. with the above. Every database has errors and this is no exception. It does help when a photo has been added.
I know for some of the people that added items it probably never crossed their minds to add a source because they found the item by standing next to it and viewing it. Unfortunately, one man that apparently viewed someone's tombstone, I am interested in and created a Genweb database, can no longer locate the stone. So for people still working on this, get the photo, GPS, map or something please. Another woman created a Genweb database and had an error in it for my family. She is no longer active so the error remains. Fortunately, the same woman had it correct in both her ancestry tree and at findagrave. I know that this woman who added over 30,000 names worked with the county, museums, and the historical society so she has done tremendous work. She hasn't included her sources but she is not someone I would dismiss either.
I am very appreciative to the people work on findagrave and even if an item isn't ideal, it can be a place to start looking.