Whose fault is it that the leaf falls on the ground?
The *Wind* that blows it away?
The *Tree* that doesn't stop it and let it fall?
The *Soil* who attracts the leaf and makes it fall?
The *Leaf* itself who gets tired of holding on?
Sometimes, somethings can't be blamed on anyone....they are so damn natural and they just happen irrespective of the fact that, that something is good or not.
It's your wish whether to accept and move on or to just keep finding someone to put the blame on.