According to Buddha the root cause of problem is greed . Greed can be any types---for money , for power, rage & too much attachment to the worldly things,
Think nothing is permanent in your life , as you came to the world with nothing , you have to go with nothing except good deeds which will remain in the heart of people . In between only a few years , 50, 60 70 80 or 90 ( in front of Time of the universe it is a fraction of second )
So , in such short span of life why to lead a such life which is unworthy ? Why to have such race of unhealthy competition , anger, ego , accumulation of wealth for next generation ? Your next generation may or may not give importance to you work .World has become very materialistic . when you become old , they will wait for you death ,so that they can get your money . Why to create such situations?
Better lead a NEED oriented life , earn that much what ever you need in this society in an honest way & when time comes just sneak away from he world .