Successful Propaganda

It is evident through social norms and common beliefs that past and modern propaganda has permanently damaged peoples abilities to seek for the truth, be it simple "common sense" or hardened majority beliefs.
Our views on good and evil, right and wrong, who the good and bad guys are , are so molded into our heads we have lost our ability to seek for the truth...maybe its laziness, maybe its ones fear of being ridiculed for a difference in belief...either way propaganda has succeeded in making us think we are the good guys today and in the past...