When does mud-slinging become something else?

Since the conviction of Paul Humpfer on charges of domestic battery in March 2008, some have said that anyone who thinks Humpfer should resign or be removed from office for his crimes are doing nothing but “mud-slinging”.

So it raises the question, when does it cease to be mud-slinging?

After all, Paul Humpfer was found guilty of committing a very serious crime, which included him using a baseball bat in the commission of battery.

Is the statement I just made considered “mud-slinging”?

Or is it a statement of truth, seeking accountability for such actions?