How, When, Why
When Do you use it?
We use the term logos to describe what kind of rhetorical appeal is being made, not to evaluate whether an appeal makes sense to us or to the audience being addressed.
Why Do you use it?
You use it to claim about one thing causing another or one thing being caused by another. It can also be used in a analogy to explain the qualities of one thing to another.
Examples of Logos
1. Injuries are cause by human error or mistakes.
2. The current economic crisis was cause mainly by the degeneration of the financial industry.
3. Hilary Clinton says that chewing sugar free gum can save many lives in America.