An agent went rogue once an enemey killed his fam.
A) first person
First person uses I, me, my
He is telling the story from his point of view so it would be first person!
That sentence is actually an example of a simile. Similes are known to compare something to another. You can tell whether it's a simile since a simile uses either "like" or "as" in their sentence as they're comparing something.
When reading this excerpt I understood authors intentions, I bet, in full measure. As he mentioned - the war is murder, thousands of people fighting for particular idea and nothing can't stop them, neither moral issues nor ethical rules. All these people are guilties of a global crime and author at any price will not support such events. Unlikely that all of these people will be punished for their mistakes or sins they have made, but if we will talk about regular crime, such as author described in the text - this actions must be sentenced to justice.
So I choose this option :
<span>B.Paine says that war is terrible, and ordinarily nothing could have convinced him to support it. However, he also believes that if a person or group commits severe crimes against him, that party should be punished, no matter who they are.</span>