I think that we have to make a distinction between achievements and Ideas. Achievements can be discarded easily, for example a victory of a athlete who cheated. But ideas are independent of the person who issued them and should continue without the person or indeed any person affiliated with that idea. You mentioned Sam Harris for example, his ideas would live on regardless of what you find if you look at his life more closely.
“What is it you most dislike? Stupidity, especially in its nastiest forms of racism and superstition.”
~ Christopher Hitchens
~ Christopher Hitchens