I'm gonna make what I consider to be an important distinction here, but I also want to say I mostly agree with you and I'm bummed by the downvotes.

I think we can lump the middle manager into two broad "types". And you seem to be exclusively describing one of the two types - the one that's, frankly, smart and "aware" enough to realize that middle management is trash, rank and file is trash, and they know precisely why they are aiming to get above everyone. It ain't cuz they want to help, of course, and they never intend to. Fuck those people every possible way, because not only do they understand that the purpose of middle management is to be the buffer between the owners and the laborers, they also have decided - with full awareness! - fuck the laborers, I want to be good with the owners.

But there's another, sadder kind of middle manager, and I think maybe your hostility is unkind and unfair to this type. This middle manager still has the wool pulled over their eyes, they really think if they work hard and do well, they'll be rewarded! And hey, isn't the fact that they've been promoted (!) to leadership a clear indicator that they're doing things right? Just gotta keep at it, the really important people keep telling me this is what they like to see, I'll finally be able to get all these bills paid / improve my life! I'm on the way up, finally.

And then that person says "YEESH managing this store is really hard, I've gotta get better at this. My leadership doesn't seem to think this should be a struggle..."

Etc., etc., for 10, 20 years as the wool gradually falls from their eyes. Not everyone is able to see things as clearly as you are. Most middle managers, I think, are basically suckers. Naive and exploited. The rest, tho, are basically monsters without enough power to be monsters. No argument there, and fuck those people.