Even, when you have a totally true and unbiased report of a true story, will it always lead to the right ethics?

I very much doubt so.

There where to many people living, that brought suffering to others without ever been punished. Many people that slaughtered others, where living a wealthy life till their end. And others, that did good, ended in poverty.

No, "true" life sometimes teaches the wrong ethics. Or should we find our ethics in slaughtering each others?