Ok, Fergie might have rallied the troops into a mass protest. And no doubt, a lot would have listened to his battle cry.
However, (and maybe I’m wrong on this), this what I see as the key point: United were a PLC before the takeover. The shares were held by investors, not supporters of the club, who were in it to make a profit. Glazer offered them a good return on their investment, so they sold him their shares. The board or directors initially turned down the Glazers takeover bid, as they obviously knew what these shysters were up to, and had the power to block them at that stage.
However, the Glazers eventually bought enough of the shares and took control of the club. A hostile takeover. Nobody liked it, but nobody could do a thing.
The only ones who could have stopped the takeover were the shareholders, who could have not sold their shares to the Glazers.
Even if a million supporters had turned up at Old Trafford in protest, there was nothing they could have done…unless they were shareholders of course!
I’d guess (on no authority mind!) that Ferguson was aware of the futility of his protest, so kept his mouth shut. Some feel aggrieved by this. I feel he was powerless, so I don’t hold it against him. You obviously feel differently.