It is frustrating to see well researched and accurate information on a tree being completely lost due to someone attaching erroneous and nonsensical information.
FamilySearch, please establish a system to safeguard family trees.
It's a single collaborative tree, not separate trees. And the information is not lost when someone makes a bad merge or attaches a record for someone of the same name. It can take some time to repair, but all the details are in the change log.