There's more to Buchanan than just that, but honestly not much more. Evidence hints that he may have been our first homosexual president which is pretty astounding given the age he lived in.

The one thing to realize is that South Carolina seceded in December of 1860 shortly after Lincoln won the election. Buchanan was glad to be on his way out of office and since open conflict wouldn't erupt until after Lincoln was president (Battle of Fort Sumter, April 1861) what Buchanan was left to deal with was a constitutional crisis in trying to figure out if a state was legally allowed to secede and if what the Federal government could do; something that didn't have a sudden urgency to it like fighting a war would. And being unhappy being president probably didn't light a fire under him at a time where he could have effected more change than he did.

In the end, the War was inevitable. Without an impetus to change, the South would have continued slavery much later into the 19th century. Buchanan was the Hoover of his era, blamed for doing nothing when what needed to be done wasn't as easy to see as it seems looking back. The questions both presidents faced came with unprecedented variables. Much was done under the twilight of Buchanan's presidency in Congress, but nothing came to fruition. Lincoln's election was too much for them to stomach and they felt their livelihoods were in danger so it's possible that Buchanan wouldn't have been able to do anything.