I have come to accept the errors I find in the online trees. When I come across something grossly wrong, I will offer to send them the documents that support the correct information. I have one deed that that describes the relationship of four people. The deed is available for the asking from the county recorder. I have offered many people to send them copies of this information.
How many people do you think has asked for the documents? I have not kept a tally but I don't think 1 in 10 have respondeed or requested to even see the information.
I would like to point out that there are some that have have been glad to know, with out a doubt, who there ancestors were.