Lincoln authored the Dred Scott decision and was responsible for the Southern rebellion? I learn something new every day. </sarcasm>
Attempting to use the straw man tactic is also intellectually dishonest. As a matter of fact, this is dishonest several ways. The Dred Scott decision remained valid until the war was over, at which point it was overturned by the 14th amendment.
You are implying that the Dred Scott decision was responsible for the disasters that were created when the 14th amendment was passed, and though Dred Scott may have been the motivation for passing the 14th amendment, it wasn't the cause of it being written so badly and with such an over broad potential for abuse.
It also didn't cause Southern States to vote for it. Federal guns pointed at them did that.
The </sarcasm> was appropriate to another pot~meets~kettle moment.