What a wonderful world

I was wondering how wonderful the world would be without preconception. pherhaps people could shake hands and ask "How are you?" and wouldn't worry about religions, money, skin color or any other subject that keeps people apart.
We already are in the 21th century and we still have mediocre people who think the skin color makes someone better or worse. The haven't realized yet the skin color doesn't say how good/honest a person is.
Another kind of preconception we still have is the religion preconception. People fight because the can't understand and respect other people who think in a different way.
Unfortunately we find a preconception within poor people because them can be despised by a person who has to realize the material things don't make anyone better.
I particulary love a song written by Louis Armstrong that talks about a wonderful world. In my own perspective, if the people would do what the song says, the world would be much lovelier.

I see trees of green, red roses too
I see them bloom for me and you
And I think to myself, what a wonderful world

I see skies so blue and clouds of white
The bright blessed day, the dark sacred night
And I think to myself, what a wonderful world

The colors of the rainbow, so pretty in the sky
Are also on the faces of people going by
I see friends shaking hands, saying, "how do you do?"
They're really saying, "I love you"

I hear babies cry, I watch them grow
They'll learn much more, than I'll never know
And I think to myself, what a wonderful world

Yes, I think to myself, what a wonderful world

Louis Armstrong