Top Reasons why employees don't give reasons why they are exiting an organization...

Generally employees don't leave an organization but rather leave their boss....... The prime reasons why the effectiveness of Exit Interviews has vanished is due to the following in my opinion:

1) Unwillingness to spoil rapport with the current company HR and Colleagues mainly your reporting manager

2) Fear of getting a poor review from past employer in a reference check process by the employee's future employer if the future employer is a competitor company

3) No one wants to become a whistle blower and point out reasons like mental harassment and organizational politics and risk a loss of reputation as everyone knows that his/her association with the organization is not for an eternity with any organization in today's times...

What are your reasons?