[Getty Images]To be clear, Manchester United's fans have - to a greater or lesser degree - protested against the owners since the Glazer family landed £600m-worth of debt on to a previously debt-free club with their leveraged buy-out in 2005.In their most recent accounts to 31 March, United had an overall debt of £1.3bn, including outstanding transfer fees.Since then they have refinanced $425m (£314m) worth of bonds at a higher interest rate than they had been previously. They