Walking out without negotiation, without paying for your share of national obligations, taking every piece of property you can get your paws on, and shooting up a fort on the way out the door are not actions that promote an amicable separation. The South wanted their war, they got it. Sorry it didn't work out the way they had planned.
Wow, sounds like the so-called RevWar.
Lincoln refused to negotiate. They tried.
without paying for your share of national obligations,
They produced the far greater majority of all payments made to the Federal treasury, and they had only 1/4th the population.
Washington DC wasn't against slavery. It was against losing the money produced by slavery which was paying 73% of it's total revenue in 1860.
taking every piece of property you can get your paws on,
It was their property in the first place, and was only given to the Federal government for the purpose of defending their states.
and shooting up a fort on the way out the door
They left in December of 1860. That was "out the door." What happened in April of 1860, many months after they had gone "out the door" was a consequence of the Washington DC government attempting to force them into submission with warships.
Wasn't you the one saying that if a man is going to shoot you dead in the street, you would attack him first?