As stated in several replies, information in databases should only be corrected if the indexer clearly misread the original record. No information absent from the original record should be added.
You can post a tree to FTJP including any information known to you from family history, if you believe this to be correct. (I have some seemingly official documents where my grandmother, who was substantially older than my grandfather, adjusted her birth date by 10 or more years...).
At present I am busy double checking an old file that has been up on JRI-Poland for some time, correcting some misread items, but mainly eliminating hypothetical suggestions that were nowhere in the records and may be potentially misleading.
Nineteenth century records were not exact. They provide any information the informant provided, and the clerk chose to register. In my extended family, there's an individual with given name Chaim in some of his children's birth records, Joachim in 1834 naturalization records, and Heymann in his son's 1887 death record. Genealogy develops creativity and lateral thinking.