I have worked in quite a few organisations, big and small. One thing that has always led me to leave is a horrid, bullying boss. I have had my fair share of them and luckily, my fair share of inspirational bosses who really helped me to learn and kick on.
In some ways, the bas bosses, who I generally experienced earlier on in my career taught me the most. They taught me that fear works in terms of driving short-term performance and can lead them to their own promotions. Long-term, it does nothing for the organisation or the people in it. Bullying and picking on individuals might push you to avoid being the target, but no one is happy and less value is created.
Interestingly, the worst bully bosses I have ever had are all female. Maybe it is fluke or random error, but certainly just as there is an alpha-male type of boss who is a nightmare to work for, there are plenty of women whose own insecurity is taken out on those below them.
I learned much more from the political and bullying bosses - it taught me how I did not want to be when it was my turn later in my career - not taking credit for things I had not doe, not randomly hauling people over the coals because I was having a bad day, not coming up with petty ideas just to trip people over, not getting angry over presenteeism and not trying to turn the team on one another - all great lessons.
Not to say the good bosses did not help, making time to speak to people in your team, encouraging them and trusting them even when you know they will make mistakes. To me the companies that do this best always end up succeeding the most in the long-term, even if the bullying ones can do better in a hit and run type market. Personally, I certainly know which ones I would rather work for.