Eminent domain allows the state to take over private property for public use. A city cannot condemn state land for its own purposes and a state cannot condemn federal land for its own purposes, unless the state or federal government consent first. Sumte was federal property and remains federal property.
Lincoln attempted resupply of the forts with men & munitions despite his promises to the contrary.
Your assertion that Lincoln planned to reinforce regardless is your own opinion. And Davis's claims are not based on fact. While speculation on whether or not the North planned on abandoning Sumter went on, and there was confusion when certain cabinet members indicated that Sumter would be evacuated without the authority to say so, Lincoln was firm in his intention to hold on to the fort.
I think the millions of Americans were right, regardless of waht any others thought.
Millions of people think Al Gore won, too.