I used Geni for about 2 years but suddenly found that someone from Hungary had attached part of their family tree to mine. It was obviously completely wrong but I was unable to remove it. I did not want to start a chain of correspondence with the interloper so I have closed my Geni account. Unfortunately, all the incorrect information is still there. It is far better to pay for and use your own stand-alone family tree program. If I could have given Geni zero stars I would have done so.
Mistakes happen. Merges can be undone, our detailed revision history system can be used to undo bad edits. The solution is to fix the problem and upload sources so it can't happen again, not to run away from it.