haha. wat i told silver was in fact very simple.
as long as there is greed and/or pride, there wont be world
peace.
u can even backtrack all the way when cavemen were fighting over
the foods they hunt, to satisfy humans' basic needs and
wants.
to amplify this action in a larger scale, especially in today's
society, we would be in luck if there are less wars, not to mention
having world peace. 
