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The Confederate states wanted to leave the Union and live in peace with them.

The Confederate government was out to get all the territory it could get, hold and rule. They were a goverment, after all. And they weren't willing to let potential Confederates in the territories and Border States down, any more than unionists were willing to let unionists in Southern states in the lurch. If the rebels had really wanted "to live in peace with" the union they would have proceded differently. They were determined to take their independence and whatever else they could get with a sword.

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I read that there was every expectation that States COULD secede from the Union and that, in fact, the Commonwealth of Massachussetts had threatened to secede some dozen times prior to 1861, and no one expected that they would be invaded had they done so. In fact, I heard there was a "Kentucky Resolution" drawn up in Congress decades before the War that essentially stated a State could leave the Union at will. In this light, Ft Sumter was fired on when the "squatters" refused to leave.