But they didn't. For folks that started the fight in the first place, it is more than sissy to cry about the outcome --- but that's what Neo_Confederates do --- cry like little girls about their "rights" when the so-called "republic" they were trying to start was all about denying rights to others. A damned drunken rebel mob in Baltimore caused the first deaths of the war by attacking troops doing no more than passing through the city, from one station to another, on their way to the nation's capital. You shoot at soldiers then or now, you got no bitch if you find a bayonet up your behind. Even before Lincoln took office, the so-called Confederate Government had a standing army, ready to fight, that was 10 times larger than the Union army. They had more troops massed around Fort Sumter alone than existed in the entire Union army, and you insist that Lincoln started the fight. You sound like Baghdad Bob.
I insist? I don't do so alone:
"For three weeks the administration newspapers have been assuring us that Fort Sumter would be abandoned... Mr. Lincoln saw an opportunity to inaugurate civil war without appearing in the character of an aggressor" - April 13, 1861 Providence Daily Post
...this unarmed vessel... is a mere decoy to draw the first fire from the people of the South, which act by the pre-determination of the government is to be the pretext for letting loose the horrors of war." - April 12, 1861 Jersey City American Standard
Jefferson Davis appointed a number of peace commissioners, in conformity with a resolution of the Confederate Congress, whose mission was to travel to Washington, D.C., in March 1861, before the attack on Fort Sumter, and offer to pay for any Federal property on Southern soil as well as the Southern portion of the national debt. Lincoln refused to even see them or acknowledge their existence (like you!). Napoleon III offered to mediate the dispute, but Lincoln refused to meet him as well.
If you doubt Lincoln's aforethought, consider as well his letter to naval commander Gustavus Fox (May 1, 1861 - after the fact), "You and I both anticipated that the cause of the country would be advanced by making the attempt to provision Fort Sumter even if it should fail; and it is no small consolation now to feel that our anticipation us justified by the results."
Of course you could be describing the Boston Massacre, or Lexington Green...
Having declared our Independence from Britain, how long would we tolerate a British Fort in New York harbor trying to collect taxes on our commerce? When they rebuffed our entreaties what do you think we would have done?