Bad leadership - Division Director and Recruiting Manager Robert Half Employee Review

This was a wonderful place a few years ago. I was with the organization for roughly 10 years in total and was a top performer in my city every year. Regularly, I was actually the #1 in that respective market. Then, 2 years ago, a new manager came in and life went from basically perfect to miserable. There are several people who have either stepped out of their leadership positions or left the company because of this person. How does this continue to happen? I think it is probably because this person has had 3 bosses in 2 years and so no one has been closely enough involved with to see it.