Our brain does not have moral judgment. It simply believes what it hears long enough. There’s an old saying I heard as a kid: “Tell a man 100 times he is a pig, and he will oink.” 
So, what are we allowing to go into our ears? You might have heard the saying that our success is found right between our ears. And we are responsible for programming what is there. And if we don’t, then somebody else will do it for us.