Too the Sheriff's dept handled the deal badly lying about how many shots were fired, (FBI later validated Weaver) who shot first (again FBI validated), how much firepower was involved, on and on the list went. The FBI later validated most of the Weavers statements. The Sheriff's department heightened the force exponentially through lies in order to save face. The FBI assumed they were truthful and acted without validating first.
However, that is in no way a comparison to the Holocaust. Innocent people were rounded up, forced into settlements, later to be routinely and systematically exterminated (not to mention experimented with), and there was no violation of any law that triggered or instigated the process. There was no mistaken or bad info, it was simply genocide and was not even in the arena of war/conflict, where one side eliminates the other (again not justified, but explainable).