An early spoiler on Smallville episode "Idol" revealed that there would be a moment that was like "V for Vendetta." There were already spoiler images released of Zan and Jayna wearing Clark's symbol at the press conference. As you can see in Zan's picture, there are other citizens wearing The Blur's symbol that claimed to be The Blur.
This scene was either cut out due to cheesiness, lack of originality, or it could have been a simple issue of time. It also could have ended up being Lois's plea time because it set up the climax of the episode and gave Lois some time to speak and stick up for The Blur after bashing him the entire episode.
But no matter why they cut out this scene, I think it would have been cool to see the entire city stick up for their hero. It would have been much cooler to hear them all say "I'm Superman" but you've got to make lemonade when all they give you are lemons.