That is not the 'upshot'. That is one poster's opinion.
"The people of South Carolina arrogantly thought they dould steal from the people of the United States"
They had been asking to buy the fort since November of 1860, and continued the quest in Washington until April 10, 1860
Fort Sumter was taken, no lives lost, and Anderson and his men sent home. This was the second time in four months that armed forces of the Union were expelled from Charleston Harbor without loss of life. The message was 'don't to to Charleston unless you want to be run off'. But war never came from the first excursion, and wouldn't from the second except for that little thing Lincoln did about calling out the troops.
Sounds as if your 'slam dunk' comparison is based on insufficient reasoning, and more on redneck posturing.
That is not the 'upshot'. That is one poster's opinion.
It was the opinion of a lot of other people too.
The feds stopped construction of the fort until clear title was conveyed. That was in 1841.
But a great many people thought it was U.S. property in 1861 too. Enough people in fact to ensure that the very same flag hauled down on April 15, 1861 was flying over the fort exactly four years later.
Firing on Fort Sumter was a catastrophe for the south. Many in the North WERE ready to let the slave states go, and good riddance. Horace Greeley went from saying that a government pinned together with bayonets had no appeal for him to joining the "On To Richmond!" crowd. The effect of the attack on Sumter and its manner has been likened to the galvanizing effect of the attack on Pearl Harbor. The CSA started stupid and it ended stupid.
Walt