This is wrong. Lincoln wasn't responsible for the fact that the South first seceded, and then the South turned it into a shooting war. The actual cause of the war was that the South started shooting at the North. Nothing the North did was responsible for that. It was wholly a decision on the part of the South. No person who was not part of the Southern leadership was in any sense responsible for the fact that the South decided to turn a legal dispute into a shooting war. The US is a nation of laws. And there is no legal principle by which one side can unilaterally dissolve a legal contract without due process. The South had no legal right to do what they did, not because a legal case could not be made for the legitimacy of secession, but rather because no attempt was made to make a legal case for secession. So as the Southern actions were first illegal, and then they started a war on the issue before Lincoln really had taken any actions at all, Lincoln bears none of the responsibility here. It is not the responsibility of the victim of aggression to immediately capitulate to the demands of the aggressor.