One of the mainstays of successful propaganda is the repetition of lies until they are held to be the truth. Even when there is doubt about the message it can still be treated as truth because a critical mass of people cannot be bothered to listen critically.
Those of us who are prepared to listen carefully hold a massive advantage. In order to tell a lie repeatedly it has to be revealed. Once a lie is revealed then it can be assessed for what it is.
There another advantage in that an organisation that has lied in the past can be assessed skeptically. When this organisation starts to spin or repeat a message then the ears can go up and open out. The message may turn out to be the truth but when the lie is caught we become forewarned and forearmed.