Both are important. The moment we stop learning from our own mistakes and the mistakes of others is the moment we stop growing and improving.
One cannot escape the two ways. Human beings have a free will to make decisions and choices and these are not always correct. On the other hand, we have opportunities to see the suffering of others through their mistakes and learn from them.It is really the way of life.
They are both equally valuable! I have a tendency to watch others make mistakes, because I feel why make the mistakes If I don't have to when so many others are doing such a fine job at it themselves making a mess of things. On the other hand my own mistakes and lessons are just as equally valuable and important.
Both because either way one is learning to become better. Personally I find I learn more when I learn from my own mistakes though, because the experience is more right in my face... one learns something MOST when they directly experience it, so learning from my own mistakes I would learn more things from so I'd find it better, but both are good ways of learning.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.