Interestingly, I saw an example of the phenomenon of people getting mad at the certainty of an essay in this very site, a few days ago.
Someone was telling the author that he would achieve more if he phrased his point in a more "polite" way, just because the certainty of the writing made the critic mad. Thankfully, the author was here in the comments responding, and he didn't budge.
That interaction was very refreshing for that very reason: The author was right, knew he was right, someone didn't like that the author knew he was right, but the author remained steadfast.
Someone was telling the author that he would achieve more if he phrased his point in a more "polite" way, just because the certainty of the writing made the critic mad. Thankfully, the author was here in the comments responding, and he didn't budge.
That interaction was very refreshing for that very reason: The author was right, knew he was right, someone didn't like that the author knew he was right, but the author remained steadfast.