[GOPcapitalist]

Why did the Konfederats not open fire on Sumter until they were told it would be abandoned in less than 24 hours?

Cause it wasn't going to be abandoned in 24 hours. Anderson told them that without supplies he would turn over the garrison in a couple days, but Lincoln sent supplies along with a fleet of warships and troops.

Fortunately, Confederate spies saw the warships departing and learned of their destination. The message was relayed to Gen. Beauregard, who in turn sent it to Davis informing them of the impending arrival of Lincoln's fleet. So rather than face a larger, better equipped force that would undoubtedly inflict greater bloodshed in a battle to take the fort, the confederates moved to preempt the fleet's arrival and take the fort.

[Held_to_Ransom]

If the south didn't want war, why didn't it just give back the hundreds of millions of dollars of cash and equipment it stole, and then having established some small measure of good faith, proceed to work out a reasonable payment schedule for all the money's it took from the north. Granted, they probably would never have been able to pay it off, but if they hadn't insisted on being thieves and criminals of the first order, don't you think the North would have considered some offer?