I said Democrats didn't exclusively own slaves. Meaning there were other political factions that owned slaves. But, now that you mention it, a handful of Republicans did, in fact, own slaves.
A platform held by a group doesn't necessarily mean everyone was on board with it. Benjamin Burton, Francis P. Blair, William Hugh Smith, James L. Alcorn, William Woods Holden, William Gannaway Brownlow, and supposedly at least four more that I'm unable to account for according to my research. And yes, some of them changed their position when they aligned with the Republican party and of course after the Civil War.
Even Lincoln considered allowing slavery to continue if it meant keeping the Union together. That was his primary goal. Not abolition. Fortunately, it never came to that.
No party "created" the KKK; both parties had ties to it.
The Civil Rights Act passed with more Democrat votes than GOP votes.
The Supreme Court ruling sanctioning segregation was written by a Republican.
You can try to make everything good and bad have some political view point but it is pointless. The point of politics isn't to weed out the good and bad people. The point of politics is to share open ideas and consider different perspectives.
Not finding ways to silence your opposition as if this were some petty game of chess.