Corruption

We see corruption all around us (I am speaking here for Indians). But there is one corruption we never think of and will probably never admit.
Have we ever sat back and thought how much our mind has become corrupt, from the time we were born? Were we born with a corrupt mind? Were we born with vengance in our mind?
No. Look at the innocent laugther of a child. Does that child know hatred? No.
So how does one explain the strifes that ones sees all around us? How does not explain all the hatred that one sees around us? Brother Vs Brother, Brother Vs Sister, Spouse Vs Spouse, Father with Son, there is frustration, hatred, dislike, disenchantment in all relationships.
Why so? Why do we become more hateful as we grow older and supposedly mature? What is inducted into our minds that we start hating, opposing, disliking, disregarding others around us?
Why can we not be like the child that has only fear of the unknown and love for everything known? Why can we not continue loving everything known and learn to understand the unknown, instead of unlearning to love the known?