Understanding events from the past can help prevent them happening in the future...Although despite us being able to see documented history quite clearly humans often repeat the mistakes from the past. Maybe having a time machine and seeing it first hand might help it sink in.
!ENGAGE 25
One thing why we need to experience things is that if we have a great negative emotional link to what happened, that is for sure that we will make it not happen again.
Still, it has to be by first hand experience so as soon as we are not in control of what happens (like a century later), then we humans can fall again by the same stone