MKD are an abomination, but their fans believe they deserve some credit for bringing league football to a fairly large conurbation and for preventing local kids from becoming armchair fans of the rags and dippers, or armchair fans of whoever their dads supported.
Not sure why they couldn't just support one of the many non-league teams that existed in the area before Wimbledon got moved.
As for Salford: I'm an occasional ground-hopper and want to see all grounds where league football has been played. Fortunately I visited Salford's ground 30 years ago, well before the obnoxious owners took over.