I totally understand and sympathize with your frustration! I am still fairly new to genealogy, and have had quite an education concerning the importance of proper sourcing and documentation.
I make extensive notes on the profiles I manage here at Wikitree. (I only use Familysearch to look for sources and evidence, and don't contribute to any profiles there.) If the only information I can find for any detail is unsourced, I will say so in the notes. I will also give detailed explanations of any discrepancies I find and describe what I have done to try to resolve them. (This is partly for my own benefit so I can see what I've already done when I go back to a profile, and partly for the next person who might come along trying to research the same thing.) And I usually put a note to the effect that if anyone has knowledge beyond mine or has found new information either supporting or contrary to what I've laid out, I would appreciate their letting me know.
I am also not above speculating, although I make sure to clearly state when I am doing so. One example of this (in case anyone is interested) has to do with the identity of the father of my third great-grandmother's children (https://www.wikitree.com/index.php?title=Dubois-3661&public=1
). This is one tangle I have declared to be a genuine Doozy(tm). (That's an unofficial genealogical term I have adopted.)
It's very frustrating to see that people all over the various genealogy sites just copy any old information they find, apparently without trying to verify it. In one instance it has gotten so pervasive that I'd estimate about 90 percent of the internet thinks the surnames Hoar and Eure are simply variants of one another, and thus connect and comingle the two families. I've been educated (politely but firmly) by experts on both the Hoar and the Eure families that there is no connection, and those folks spend a lot of their time playing genealogical "whack-a-mole," so to speak, trying to correct the errors.
But overall, I'm finding this endeavor to be one highly-addictive way of passing the time, and it's nice to be able to check in and compare notes with my fellow addicts. :) A while back I posted something about trying to determine the identity of the husband of my 6th cousin 4 times removed (which led to an epic Doozy) and someone replied that anywhere else, need for details on a 6th cousin 4 times removed would warrant serious consideration of one's mental health, but around here, it's just business as usual! :D