Let's review the actual context:
A judge, two deputies and a court reporter had been shot in cold blood. The judge the comment was made about was in his own courtroom when he was brutally murdered. The sentiment "good riddance" was made in THAT context.
It was not some theoretical "good riddance to activist judges" comment. It was approving of this heinous act if the judge fit a certain profile.
The anger toward that poster is completely justified.
Yes, and Oh, hell, yes.
Gotta help keep the place tidied up.