Maybe because the war was a topic of some interest to those assembled? </sarcasm>
Besides Lincoln summed it up very nicely: "Both parties deprecated war; but one of them would make war rather than let the nation survive; and the other would accept war rather than let it perish. And the war came." The South made war. The North accepted it when it was forced on them.
Again why is that topic of no interest to any historians of the modern era? Because the war mongering goon is justifying his lack of foresight to avoid the conflict. It doesn't fit the contrived narrative that the North was just sitting there minding there own business and the nice Mr. Lincoln was throw onto the fray.
There it is I said it. It is true. Live it learn it love it. The truth will set you free ..