You hear some irresponsible guy on talk radio arguing that the government is preparing to ban the sale of vapes. Initially, you discount the message because of the messenger's lack of credibility. But over time, the message has a chance to influence your views because you dissociate the source of the message from its content. Down the road, the idea may not seem entirely far$-$fetched.

This is an example of what concept?

$$ Credibil

Terror Management Theory

System Justification

Sleeper Effect