Images of paranoia presented in films made in a period reflect trends in social science of that period. Paranoia is a condition that keeps changing along with changes in society. The shift in perception by social scientists from the 1960s to the 1970s resulted from an inability to find a successful cure for paranoia. The world is becoming more and more threatening.
In the 1960s paranoia was viewed by social scientists as ungrounded fear of powerlessness, and the theme of paranoia as it relates to feelings of powerlessness was dominant in films of that period. In the 1970s paranoia instead was viewed by social scientists as a response to real threats from society. Films of this period portray paranoia as a legitimate response to a world gone mad.
Which one of the following is a conclusion that the statements above, if true, most strongly support?