We're working to produce an accurate, well sourced tree on Wikitree. Disconnecting unsourced parents does no real harm, they can always be reconnected when the evidence turns up. Meantime more research is encouraged. As to no win situations there will be many cases when nothing further can be achieved, not all brick walls can be broken down. We've have probably all found twaddle handed down from our forbears. What they have said can only be good for a couple of generations. For example my great grandson has a photograph taken on his naming day of all his blood kin who were present (including 5 great grandparents), it was blown up and hangs on the wall. His parents have used it to explain which of these relative might be coming to see him. He knows us well and will probably have no trouble remembering us for the rest of his life. However, he hasn't the slightest idea what, for instance, my maiden name was, so for all that effort his knowledge will extend only 3 generations. Anything else needs careful scrutiny. Wikitree is not a private passtime, it has a very public face, and there's lot of help here to get it right.