To begin with Lincoln caused those deaths. He is the one who chose to start a war to impose federal government rule on sovereign states which did not consent to it.
How the hell do you people call yourselves CONSERVATIVES yet at the same time ignore the Declaration of Independence "Government derives its legitimacy from the consent of the governed" and the 9th and 10th amendments to the Constitution which says all powers not delegated by the states to the federal government are reserved to the states AND you can't claim that if the Constitution is silent on an issue then that is a power or right that does not exist?
A Decleration founded by men who created the US, bot fought against it. A Decleration that declared All Are Created equal. GOD had the final say,and the US was re- unified.