The Hashmonaim are an integral part of the Hanukkah story.
BUT after the story of Hanukkah the Hashmonite family did some very terrible things (wars between Jews etc) during their reign.
Why do we celebrate the Hashmonite victory during the story of Hanukkah if they became so corrupted afterwards?
Why do we not just celebrate the victory and the oil? Is there any reason to mention Matisyahu during our prayers at all?