Why are people able to merge into my tree without my permission?

I have had people suddenly merge into my tree with garbage merges where the only relationship is the first and last name.  I cannot remove those bad merges from my tree, and additionally, I have others merging into my I do not want.  Why is this allowed to happen?  There has been a huge investment in time making the tree accurate and then to just have some random stranger plow into it and merge it like this seems insane.  Is there a reasonable explanation for this, and is there a way I can fix what they broke?

Thank you


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