That is what the Nazis called 'the big lie'. They were convinced (sadly with good reason) that repeating the same lies over and over a few people would be accept them. With those few helping to spread them, and even adding more lies to them, more people would be similarly convinced. In 'no time' you can capture the belief of the majority and then the REAL lies can start.

eg. Everything is the fault of X and if X is eliminated life will be a bed of roses. a bowl of cherries, hunkey dorey, etc and we'll all have the ideal family in a four bed home, 2 acres of garden and three Cadillacs in the garage.