Italians were reduced by about 89 percent
The Congressional and Presidential Reconstruction Plans had differences as regards the intensity of amnisty and leniency they managed. President Lincoln believed that he had the power and the obligation to carry on the Reconstruction. However, the Republican Members of the Congress did not agree. They said that it was the Congress the one with the power to reconstruct the south.
The one that is incorrect is this one: The massacre began because of a violent outburst by protesters towards passerby that supported the current government. Simply opposing the regime was a crime in their eyes, and thus the massacre happened.