I wonder what the "vetting" process of the info is? I know with my family there has been slight variations of the who's who and where they fit on the family tree. Apparently with some geanolgy sites they have the birthplace of my grandfather wrong.
There is no vetting process that I know of. In fact the issue you raise is the biggest problem I have encountered. The bigger your tree, the bigger the issue.
But each and every tree is the product of its own author's decisions. You don't have to share your tree and others don't have to share with you. However, I'd like to think (and have generally found) that everyone is interested in accuracy. So it usually all boils down to the credibility of the data and the evidence. I have changed my tree because of others and others have changed their tree because of me. But sometimes, you just have to agree to disagree.
Edit - you can also enter several alternatives when it's not obvious what is right. This can sit as is for as long as you want. When and if information gets discovered to convince you one way or the other, you can hide an alternative or save it as background.
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