Stages of Grief

The five stages of grief was first introduced by Elisabeth Kubler-Ross in her 1969 book On Death and Dying. It describes a process by which people deal with grief and tragedy.

The five stages are as follows, Denial, Anger, Bargaining, Depression and Acceptance. I think we all go through these five stages but I wonder why we do it in these five stages.

When I talk to people they clearly accept that the need to go through these stages but the first four stages clearly make us unhappy and the fifth gives us peace. So why do we not just go to the fifth stage? Why do we have to go through pain and suffering before we say we have enough with pain and suffering and accept? Is it possible to bypass the first four stages and come directly to the fifth stage? When I ask people about it, they look at me like I am crazy. But why should we say that it is inevitable to go through these stages just because thats what we have been doing it all these years. We might have a predisposition to it but cant we overcome our predisposition?

Why should we go through these first four stages of suffering and emotional pain before we decide we have enough of pain? Why should we not just move directly to stage five?