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 author addresses the religious violence that has been practiced in universities.
He affirms that although everyone has the right to expose their religion in public places, some leaders have used this right to be violent and disrespect the students' religious freedom.
To prove this, the author shows a series of cases, which occurred in universities, involving religious people who threatened the physical and moral integrity of students.
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.
1) He gave his tacit approval in letters to the media. 2) Dean was beginning to have serious reservations about the trip and his tacit agreement to it now that it was a reality.
3)He kept his tacit knowledge at a distance from the investigators
