The author uses real cases as evidence for his arguments. This range of evidence increases the credibility of the arguments and shows that the author is correct.
From questions similar to yours, we can see that you are referring to the article "The Right to Preach on College Campus," written by Ryan Joy.
According to the reading of the article, we can conclude that:
The use of evidence is made to prove the author's arguments and establish a high level of veracity in the article. This feature is presented in "The Right to Preach on College Campus" through the constant use of actual and documented evidence.
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