It's starts at the top and culture permeates the company.

I worked for a $2.6 Billon international corporation. I was surprised to learn quickly that the culture was "don't make waves". They hired the wrong people, and fired the employees who demonstrated dedication and presented great ideas to progress the company. It was obvious the CEO level didn't really want employees making a few waves to progress the company.

They promoted unqualified employees and fired some of the most qualified people.

It was a disturbing place to work at times. Fortunately for me, I worked for the very best manager I ever worked for. You would never guess he was a Marine Training Instructor is his early life.