The more interesting question is: what do we do with the art of people who were revealed to be terrible? I first saw people wrestle with this idea for Michael Jackson and recently it has been a big issue related to Kanye West.
The person who solved global warming/cancer/whatever turns out to be a terrible person? Should we throw away their work, and come to a different answer? Or wait a few generations so people forget and come to the same answer again but the people involved are “pure”?
The problem with unethical behavior in sciences is that you have to check - which you should be doing anyway, but once someone has been exposed as a fraud the community as a whole needs to go back and clean out all the fraud by checking all their work. Unethical behavior in someone's personal life doesn't necessarily invalidate that.
Although I don't see many people talking about ReiserFS these days.