The statement in question was "[p]lease you post any proof that Confederate administration advocated the wholesale slaughter of Americans in disagreement with them."
Already answered. This thread is loaded with examples, from Eastern Tennessee to what became West Virgina. Fanatical 'Confederates' terrorized or murdered those in the South poising a viable threat to stopping their domestic rebellion against the U.S. government.
In many cases Confederate traitors, bullies, tricked & forced Southern men into their pre-plotted service of sedition against their own country. How appalling.
Senator Benjamin Wade (Ohio), speech in the Senate (21st April, 1862)
"If there is any stain on the present Administration, it is that they have been weak enough to deal too leniently with those traitors. I know it sprung from goodness of heart; it sprung from the best of motives; but, sir, as a method of putting down this rebellion, mercy to traitors is cruelty to loyal men. Look into the seceded States, and see thousands of loyal men there coerced into their armies to run the hazard of their lives, and placed in the damnable position of perjured traitors by force of arms."
Senator Benjamin Wade should have replaced Andrew Johnson as President, and would have if only one additional man of courage would have voted to impeach. The Southern Confederate upper crust of the former Slave Empire would have then been properly taught to never even think about dragging this nation into bloody civil war.
When a grouping of renegade politicians, on the payroll of Plantation Inc, along with turncoat Southern military officers conspired to provoke civil insurrection in section of The United States, totally cognizant of the potentials of horrendous future losses of life, they never-the-less proceeded full steam ahead, resulting the greatest domestic loss of life.
Now some words from the barbaric, arch war criminal Jefferson Davis.
'ADJT. AND INSP. GENERAL'S OFFICE, Richmond [Va.], December 24th, 1862.
GENERAL ORDERS, No. 111.
I. The following proclamation of the "President" is published for the information and guidance of all concerned therein:
BY THE PRESIDENT OF THE CONFEDERATE STATES. A PROCLAMATION.
. . . .1
Now therefore, I Jefferson Davis, President of the Confederate States of America, and in their name do pronounce and declare the said Benjamin F. Butler to be a felon deserving of capital punishment. I do order that he be no longer considered or treated simply as a public enemy of the Confederate States of America but as an outlaw and common enemy of mankind, and that in the event of his capture the officer in command of the capturing force do cause him to be immediately executed by hanging; and I do further order that no commissioned officer of the United States taken captive shall be released on parole before exchange until the said Butler shall have met with due punishment for his crimes."
..3. "That all negro slaves captured in arms be at once delivered over to the executive authorities of the respective States to which they belong to be dealt with according to the laws of said States."
There you have it - sickening.