This is a repeat of requests I've made before. AFAIK, the Proven/Disputed/Disproven tags on facts and particularly on links between children and parents, has never been used for anything. I would like that to change. The information is to valuable for RM to ignore. Currently you can have a "Disproven" link between a parent and a child and RM's tools (Charts, Calculators, etc) just ignore it and act as if the link is "Proven". I would like to see options in tools like Relationship Calculator, Pedigree Charts, etc that would either skip past Disproven or Disputed links or at least flag the results to show that they contain disputed or disproven links.
Also, I'm not exactly sure why a disproven death date is treated the same as an undisputed one. The only difference in the program seems to be that a red line is drawn through it on the Edit Person screen. Just cosmetic.
As for why anyone keeps disproven or disputed information in their database, that's a different issue.