I guess I can agree with that, although I'd like to know what you think Lincoln should have or could have done differently. He was put in the most difficult position which any American President has ever been in...
Instead, as we know, he did the following: sent over a million men to their deaths (millions of others were crippled and maimed), suspended the ancient right of habeus corpus, debased the currency, created the first income tax (thus leaving a dangerous precedent), and imposed the first national conscription in American history (another dangerous precedents). While the war did lead to the abolition of slavery, the same folks who seceded were back in the driver's seat in the South by the 1870s and blacks were confined to second-class citizenship for nearly a centruy.