What is the main purpose of humens life?

There is no purpose . Unless you call living a purpose and even that isn't what all humans want.

We were created to receive from God and love He didn't want robots, He wanted real love. In order for that to happen, He gave us free will, but mankind loved the flesh more than God. Mankind used free will/choice and didn't choose God.

The reason that we are here is that we may overcome every folly and prepare ourselves for eternal life in the future. We came to earth to prepare ourselves for eternal life. It is necessary that we go through this mortal experience, or probation, by which we may prove ourselves worthy, through the aid of our elder brother Jesus.

You are that which came from nothing on your way to all things... therefore look and observe and see the the path to this progression.. it is all around you and within you.

The purpose of life is to reproduce. Nothing more and that isn't even mandatory as you can always serve in a supporting role.

The purpose in life is to love, live, have a family, and to help other. Well, that is mine any ways. Each person has a different purpose, and a chose to live out their purpose or not to live out their purpose.

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.