I don't think it should be taken down, nor a special note added to give context. The picture itself is slightly provocative, but hardly risque. Standing alone, outside the news, I wouldn't give it a second look among other works of art. Balthus was likely a pedophile, but special treatment explaining the shittyness of the maker is a slippery slope.
Caravaggio was a murderer. Should his work have disclaimers? Should Alice in Wonderland have a forward explaining the author took nude photos of young girls and was very likely wanting to marry an 11 year old named Alice? Should a DJ read a statement before playing Michael Jackson?
The creator of this statue abused his daughters (Gill).
My point isn't to defend shitty artists, and I fully respect the arguments being made against the painting. However, I rather like the Met's response:
Moments such as this provide an opportunity for conversation, and visual art is one of the most significant means we have for reflecting on both the past and the present and encouraging the continuing evolution of existing culture through informed discussion and respect for creative expression.