It, and the over-the-top propaganda that went along with made people dismiss any discussion about the harmful effects as just more of the same. People don't like being lied to.
You are the one using it as propaganda, as the left has since they started using it in the 1970s.
It was something made by a church group in the mid 1930s and is used as propaganda by the left since they discovered it in the 1970s.
You are using it right now in 2014, the left has many techniques like this, it is one reason Bill Maher and his type are so effective.