Then why do those complaints get buried and I get a talk with management approx: "we couldn't find anybody else for that job, try to tolerate them as best as y

Then why do those complaints get buried and I get a talk with management approx: "we couldn't find anybody else for that job, try to tolerate them as best as you can for the time being"? My coworkers are the engineers by my side who never complain about me, quite the contrary, they cheer when I put down middle management leeches.