Agreed, Anne, but one would presume that whoever proposed the merge has good reason for the merge, other than the fact that the profiles look similar. Quite a few proposed merges are very clearly not the same person, different dates, different parents, different spouse, yet they get proposed simply because they have the same name. Why propose a merge unless you have conclusive proof that it is a duplicate ? I'm thinking that if the proposer has some responsibility, and you are unsure if a merge should go ahead, you can then refer back to the proposer to resolve any problems.
Also, what happens to a proposed merge, where the manager is unresponsive, and they have provided no sources. Do they get deleted, or do they add to the ever growing list.