1 Historical review: Some topics are better understood if a brief historical review of the topic is presented to lead into the discussion of the moment. Such topics might include "a biographical sketch of a war hero," "an upcoming execution of a convicted criminal," or "drugs and the younger generation." Obviously there are many, many more topics that could be introduced by reviewing the history of the topic before the writer gets down to the nitty gritty of his paper. It is important that the historical review be brief so that it does not take over the paper.
It is also well known as rhetoric , because an assertion itself isn't really a proof of anything, or even a real argument - assertion only demonstrates that the person making the statement believes in it. An inability to provide anything other than an argument by assertion may be the result of brainwashing , basing ones belief on blind faith or ignorance as to what forms a proper argument. Those who argue by assertion often do think that they're making a real argument. They might simply not realise where they haven't provided a full argument. The point of constructive debate or discourse is to draw attention to this sort of thing, and for people to further develop and evolve their arguments in response. A truly fallacious argument by assertion is when someone continues to assert without advancing their argument, even after it has been pointed out.