Because a game stopped due to fans protest gains more media coverage. It highlights the reasons why the fans protested which leads to more people becoming aware of the Glazers and their regime. It leads to sponsors asking questions of Utd executives as to how can they continue investing in a brand that is being shown in a negative light on the media. All of this contributes to ramping up the pressure on the Glazers, if not to sell, then at least do everything they can to appease the fans so this negative spotlight is removed.How do you "renegades" think 200 hooded goons breaking in and messing the ground up and potentially messing one game up is going to force billionaires to sell a ground in a country they never go to?