I take it you mean this in all seriousness? Have you ever played Chinese whispers? Do you automatically assume that every person you ask is being completely honest with you and with themselves, and that they have the capacity to accurately recall every fact you are asking about? You're confident that they are an authority -- that they can correctly interpret the events and relate them without error?

So witnesses in court are always completely reliable are they? And their stories never contradict each other?

We can also ask someone about something that happened centuries ago, can we? And this is more reliable than trying to find empirical evidence?

I'm still waiting myself for an explanation of what are the apples and what are the oranges. Looks more like a fruit salad to me.