On the "But they spent money" argument, it is true that they have spent large amounts and the club management have been super crap in spending it the way they have. From our CEO to the scouts and negotiation teams, we are hugely incompetent in buying and selling. So there is an argument that the money spent has been wasted. The money we spent is more than enough to come up with acompetitive team and a competitive manager.
Having said that, the buck stops with the Glazers, because everyone at the club are their employees. So they are answerable and directly responsible for the quality of the staff.
The main problem with Glazers is that they don't seem to care much about football. They don't even seem to be good at business, because it is unbelievable that they don't see the need to employ good employees to get good output. Or maybe the output they are looking for (money) is flowing well.