Socrates never wrote a single thing down and was, somewhat ironically, opposed to writing. The reason is that he felt that words cannot defend themselves. They can be twisted, taken out of context, and misrepresented, with none there to defend them, provide that missing context, or what not. Fortunately his student Plato disagreed so here we can discuss him 2400 years after his death.

With a dead person, I think this logic holds to an even higher degree. Personally I'm not really sure whether I agree or disagree with it, but it seems pretty reasonable, especially if we don't hyperbolically immediately leap to absurdly extreme examples like Hitler or whatever.