Why did alexander hamilton stephens believe that president lincoln had "made the use of force necessary"?

President Lincoln made the use of force necessary because of his prior military actions that show that he already assumed war and has been prepared for it. The South did not like the coercive policy, diplomacy using threats, that the President had sent.  Alexander Stephen that Lincoln's provocative actions will not help to stop the war. Instead, it pushed the South to justify it's use of force when necessary.