Ah, yep, reasons.

If managers can't do the job then you either train them or fire them and get others to do the job better. If they won't accept training or you have done repeated training sessions and still don't cut the mustard then it's time to find new managers.

Should a company keep managers around who can't do the job just so the managers have a job? What about the employee's of the company who miss their yearly bonus because management can't grow the company well enough to have a decent profit? What about the other people who would benefit through a job if the company was successful enough to expand? What about the customer who would benefit from a better run company?

Sorry but the inefficient manager as a single or small group of entities doesn't count for as much as all the others hurt by their inability to do a good job. The needs of the many outweigh the needs of the few or the need of the one.

(Oh wait, I can bet this makes me heartless since I'd be in favor of someone losing their job for the benefit of a larger group of others.)