Your argument to "just move on" is reminiscient of the initial response from your right-wing predecessors who argued that Nixon should be left alone because "everybody does it", and is equally myopic.
Todd Gitlin, a professor of culture, journalism and sociology at New York University, sums it up when he writes:
"Casting a blind eye on the past is not new, least of all in America, where optimism wins elections...But when the country risks forgetting deficiencies in the democratic process, there should be no statute of limitations on remembering."