Firing Federal Employees

This FCW post covers a USAToday study showing:

By researching the Office of Personnel Management’s database, the newspaper found that the job security rate for all federal workers was 99.43 percent last year and nearly 100 percent for those on the job more than a few years.

 I'm sympathetic to the idea firing employees is too hard.  On the other hand, there's some unknown fraction of the people who leave their jobs voluntarily who really don't. I'd love to see a study which compared job leaving rates among similar jobs in the federal and state governments and private enterprise. I don't know what it would show--maybe federal managers are skilled in making life uncomfortable for employees they want to get rid of.  Or maybe it would show managers are skilled in making employees to turkey farms, where they do no damage, except to the taxpayer.  Or maybe it would show managers are masochists who just suffer with their unsatisfactory employees.