I don’t need to research anything.
Firstly, those league titles and the CL were all over a decade ago. They should be judged more closely on that period than the first decade of their ownership as that is more a product of their decision making and a more competitive footballing environment. If they’d won a couple of league titles in that period, or even one in the last five years then you’d have a point. But they haven’t, despite outspending everyone in that period.
The inept football management to which you refer were all appointments ultimately made by them.
The lack of any strategy around player recruitment is also on them, as owners. Individual errors in recruitment, or even those over a couple of years can be pinned on individual managers, but when the club keeps wasting money over the course of a decade how can that not be the ultimate responsibility of those at the top?
There is a cancer in that club, as there has been for the last decade, and they are the constant thread that runs through that period. That and the GPC stinking the place up. But again, they’ve done fuck all about that.
Are you suggesting they bear no responsibility for united’s decline over the last decade?