In this article, the author suggest four tests for assessing the ethical use of metaphors such as naziism and slavery in public discourse. I'm interested in DU's collective response ...
http://chronicle.com/blogs/conversation/2013/12/03/the-ethics-of-metaphor-2/
1. The History Test. How closely does the metaphor correspond to the facts of the case, as best we understand them? When the Arizona congressman Trent Franks compares abortion to genocide, for example, we can begin by asking what is meant by genocide, what forms does it take, what are its legal definitions. Where has it historically occurred, and under what conditions? Who has sponsored and who has suffered it? In short, we attempt to understand the term in all its legal, cultural, and historical contexts. And this means we have to know what such terms mean before using them.
2. The Resonance Test. Certain metaphors and similes have a unique cultural power to incite. Such language goes beyond literal meanings to invoke longer histories of associations and images. “Hitler” is one such term. When we think of Hitler, we think of more than an individual, no matter how invidious. We recall the Warsaw ghetto, the death camps, and the gas chambers. “Hitler” is not simply the name of a person; it is a vessel brimming with historical memories. It is a bell that, when you ring it, the room is filled with other sounds, other echoes. There are many such terms: “lynching,” “blood libel,” “apartheid.” If we are to use such terms, we need to attend to their place in our collective cultural consciousness.
3. The Proportionality Test. Is the seriousness of the metaphor proportional to that which it is applied? Some years ago, I read a story in The Boston Globe in which a sportswriter described the walls of Fenway Park as closing in on the visiting pitcher the way Russian tanks surrounded Czechoslovakia during the Prague Spring. The metaphor failed, quite horribly, the proportionality test. When sensationalism overcomes judgment, we may be entering the realm of unethical discourse.
4. The Quiet Room Test. I use “Quiet Room” here to indicate a place for writers’ self-examination. The final test of the ethical metaphor, in other words, is the one we administer to ourselves. Deep down, we know—do we not?—when we are arguing to incite or to enlighten, to inflame or to understand. The last test, then, is the one we take in our own Quiet Rooms, evaluating the intentions and effects of our words.