what does Shuster and MSNBC need to do make amends for the mistake?

This is not snark.

In my opinion, the suspension was both warranted and equitable. Do the Clinton's want more? If they want firings, who do they want fired? Shuster for one stupid comment, or Matthews for his litany of crap? If this is about Matthews, come out and say it - say that they want Matthews fired. It will never happen, but at least be upfront about it. Matthews will not be fired and the Clintons won't try open warfare with Matthews, because they might need to get free airtime on his show and he has too much juice.

If this was about anything other than political opportunity, it would have been over after a news cycle. It also would've been over if the HRC campaign was flying high instead of reeling from a string of defeats.