What are you arguing? Do you even have an argument? It seems like you're replying for replying's sake, all you've said is "Man Utd are a company, the Glazers own them".
My points are:
1) They killed the club with the large interest payments (£70m a year) between 2005 and 2010. The CL winning squad withered away and once SAF left we've tried to play catch up, but badly. In the same time City signed players like Aguero, David Silva, Fernandinho, Kompany, and Sterling and De Bruyne if you want to take it as far as 2016 when we started to spend £80m a summer on a single player. We may have spent a lot since 2016 but it was 2008 to 2015 that teams like City and Real built their clubs, when players were cheaper pre-Neymar and PSG. Cake on top of course is the debt payments, dividends, and directors salaries continues to go out which could've been used to bridge the gap - that amounts to around £20m, £20m, £10m so about £50m a year. It's legal? Well that's great, doesn't help us.
2) Our board and directors are the 6 Glazer siblings and one or two others. They have no operational ability - they're essentially glorified trust fund babies milking the assets their father built. You want to blame local management as you term it, but who appoints the CEO? Who's in charge of making sure there's operational excellence within a company? The board, the chairmen, the CEO. Ours are severely wanting. The John Henry comparison is to someone who's built their own wealth, led another team to operational excellence and then applied the same to Liverpool (and no Tampa Bay and getting lucky by signing Tom Brady after 20 years of no playoff wins does not count).
If a majority of the blame for our current predicament doesn't go to the Glazers, well I'm sorry, we might as well lobotomise ourselves because clearly we no longer need brains to think with