Couple thoughts on the separating art/artist question:
1. If we extend the idea beyond artists to business leaders, politicians, scientists, etc, it's almost impossible to cut off exposure to or "support" for people (living or dead) that have done something really bad. The list of abusers, rapists, murderers, murder-subsidizers, human traffickers, con men/women, etc who have achieved something of consequence is long and make for one hell of an university alumni list...the world would look much different without their genius so I worry about drawing so many lines in the sand that I find myself out of beach.
2. I think it matters first if the person is still living and stands to benefit from his/her art or accomplishments. If s/he is, then hopefully the justice system works. These works often aren't singular though. Should everyone who worked on Good Will Hunting or Bohemian Rhapsody have an asterisk next to their work because Weinstein produced the former and Brian Singer directed (most of) the latter? Should everyone who works at a company suffer for the sins of its leader(s)? Let's say a chemical company that knowingly polluted water sources or whose founder supported anti-semitism (thinking the recent debate about Henry Ford)? The point is --- the sinner isn't the only one to suffer if we boycott.
3. For the deceased, I guess you hope for an honest accounting of their legacy. Michael Jackson was a genius and a pedophile. Richard Nixon was a crook but did a couple of damn good things for the nation. Some people seem to have an awful hard time with the "both things can be true" nature of people and only want their heroes fighting villains.
4. How long do we think Michael Jackson's name will be relevant in popular culture? 40 years? 50 years? I can name an artist or two from the 1950s and 1940s. The 30s? 20s? I got nothing. Do we think he's the Mozart or Beethoven of our musical era? That is, will people still know his name and his music hundreds of years from now? If so, there will be plenty of books written about him and his predilection for children will undoubtedly be a part of that as it should be.