If you can get a logical answer to that question, I would sure be interested in hearing it.
The process is not just to arrive at a nominee, it is also designed to allow the healing process to begin. Especially with the number of candidates this election and the personal nature of the campaigns, healing the hurt feeling and uniting for the real battle upcoming is vital. Cheer leading and a my way or the highway approach might feel good but you don't win a general election by excluding a good part of your base.
For example...?