Okay, that I can understand. Your original post made it sound like you thought the entire idea of the disguise to be unrealistic and unjustifiable. The criticism regarding the residents of Smallville is understandable considering the fact that we know that Clark returns there as an adult and saves a lot of people without a Superman disguise. I think, in the end, it would be fitting and consistent with the film's themes for Smallville to help keep his secret. For the reasons< I've mentioned, I really think that the Us government not knowing can be portrayed believably. In regards to Lois, as we all know, it is likely that they will do what Donner did and have her find out and perhaps even be in on the disguise from the beginning. The rest of Daily Planet can believeably be fooled. Other than Lois and maybe Jimmy/Jenny, none of them really need to have any direct contact with Superman. Also, if as some set photos indicate Metropolis Clark predates Zod forcing Superman's public debut, I can see them failing to put two and two together. Look at all the times that people have committed horrible crimes in secret and their co-workers and family and friends go on the news and tell everyone how shocked they are when most people at home, based on the reporting of evidence at the trial or where ever, are thinking to themselves how stupid can you be?
However, let's be honest, none of thse really matters. Movies are about plausibility and building a coherent fictional universe, people will ignore inaccuracies or absurdities in "realistic" films like Nolan's Batman trilogy so long as you tell them an entertaining tale, treat it seriously, and give a somewhat convincing explanation. You should go back and read the years' worth of "realism" debates on the Bat-boards. Hollywood "realism" has nothing to do with actual "realism".