In this paragraph he talks about him debating whether or not he should speak up, and he messes around with the consequences of doing so. (Ethos) Hes trying to convince the reader what he had to go through to write this
Shall we try argument?
In this paragraph he talks about or directly to the president asking him if he can see what he sees, and he asks him to do something about it. (Pathos) Hes trying to convince the president and reader with his emotion.
In this paragraph he adds reasons to what he proposed in the previous one by adding a more factual take on it. (Logos)
In this paragraph he puts a more aggressive tone in the way he's talking so he can try to persuade with another form of emotion. (pathos)