USCIS said the burden of proof is on the shoulder of an applicant. But it seems only thing one does is to hope one does not have some criminal records, which is not affirmative way for proof. I wonder if one can domument his own good deeds and collect them and present documentation with the application pacakges. The examples: if one donate to charities, one can get all recepts and submit thme with the application. If one find he gets more changes than should when shopping, one return the money to teh store and ask teh store manage to write a commendation letter and submit such a letter with teh application. If one does something gallant, like help others, one should ask recipients of such assistance to write commendation letters to USCIS too. etc and etc. But if you these, would USCIS say you are just showing off and solely do these in order to prove you have a good moral characters? Well, if they do accuse you of showing off, you can retorrt by saying "Hey, it is you who want to me to prove my good moral chacrater!"