‘Loss of confidence’ doesn’t explain enough about command firings

Throughout my career, I think I had senior leaders fired, er, experienced their 'confidence being lost' exactly twice. We in the command were told why. That's it in my 37 years, 6 presidents, and 4 governors. Now, it's almost a monthly thing. Either their are some folks with some serious failings finding their way to Battalion Command and above, or it's a purge. I know what my heart tells me, but my head says another thing so it's just subjective to me.