@salima,
In this thread I am not trying to make any sort of serious ethical judgment on the use of charged metaphor. I am trying to bring to the fore some things that I'm not sure everyone thinks about when communicating. Things that language accomplishes indirectly or rather accomplishes on a secondary or terciary level. In linguistics some of these functions are called pragmatics, in anthropology/sociology they can be called frameworks or cultural/cognitive models. The easiest way to explain is "what is the writer saying about himself, her situation, his ideology, her expectations that isn't in the actual semantic and syntactic presentation of the language?
Any contextualized metaphor or metynomy leaves holmesian trail to the core of the writer if one looks at it. It is not deconstruction per se, it is the application of what you know as the cultural framework to the expression. We do this everytime we read another's post. There is an intimacy between interlocutors within even the coldest of language. There is hopefully what they want you to understand, there is what you will understand in spite of what they want, there is what you understand about them that they may not know they are saying, and there is what they are expressing outside the actual language itself.
An example of this might be the folk model of the term 'technically'. It forms several epilinguistic functions in regards to its own utterance and the combinatorial semantics of its context. It hedges or insulates the speaker/writer from plausable responsibility for the utterance by removing him as the originator of the information and replacing some other, often nebulous source of the information. This makes it so that if the information is wrong the reprisals can only go so far as the third party, much the same as the hedge 'to the best of my knowledge'.
'techincally it was the etruscans who....'
'its technically illegal to ... but i don't mind'
'technically a torta is made with....'
The term also expresses an appeal to trusted sources which by extention is an appeal to trust the speaker/writer. Although it sounds pedantic, is is hardly ever used in peer to peer conversation/writing. It is normally used when a person regarded as having inferior status (not necessarily in the subject at hand) is correcting or attempting to gain status of some sort iwithout risking personal status if she is wrong.
Metaphor and analogy, much the same way can be analysed formally for its epilinguistic functions and manifestations. An example might be in a discussion revolving a topic concerning even minimal violence, an analogy using animals instead of trees or stones will evoke different emotions, although the tree or stone analogy might be just as informationally apt. An analogy about the violent formation of igneous rock will definitly be taken different than the process of training a fighting dog which will be taken differently from the process of building a ship out of lumber. All apt metaphors for anything that starts from raw materials and ends with an unflappable finished product. The anaology/metaphor a person chooses when put in context with the rest of the text and previous exposure to texts/conversation not only reveals much of what she he trying express, it also reveals their attitude towards life, the subject at hand, their audience, their status in life, their upbringing etc...