This is the way that they look at all western history. They see nothing except the bad things, but accept as a matter of right all the good consequences.
It's the "Grant Was a Drunk Who Soldiered" School of History.
Have you read "April, 1865"? God, what this country owes to Grant, Lee, Sherman and Johnston. Among them they made the peace. I can see how bad it might have been by looking at the history of Reconstruction.