I think there’s something to be said about timeframe even for individuals who held deplorable views. Purchasing art from a dead artist doesn’t go to supporting their life or spreading their shitty viewpoint - instead it will go to a company which holds the rights or an estate which benefits the family. Unless we happen to know the company/estate is deplorable in some way or another, we shouldn’t judge them based on the connection with the original artist - after all we don’t get to choose our parents and may not hold the same views they do.