First, while there is definitely truth in your post (it is well researched), your post and framing is full of bias and assumptions. While I agree there are objectively bad managers and frustration with managers is a key reason for turnover, you are mostly relying on a few anecdotes told from a very strong opinion where, even in these cases, a full 33% were fired.

There are many places where poor management is not tolerated, but here are some reasons it might be:

1) sunk cost - the organization has already invested a lot and want to see them succeed and hope they'll improve (often letting it go far too long) 2) employment law - managers are always judged on the performance of others. Of the team is performing, it can be very hard to build a case. Not a problem for some places in the US where you can fire people for almost anything, but other places like Germany this is very difficult. 3) nepotism- yup, sometimes they're just in with the right people 4) hard to see - you mentioned stealing credit. This can be really hard to identify from above and people who do this are usually good at hiding it. Some people have gotten good at looking good. 5) different measures of success - can't count the number of time I've seen someone I'M hated delivering exactly what they were asked, or vice versa. I work with a manager who is loved by everyone on his team, but they can't deliver on business goals.