> So they started voting for the people responsible for the KKK and Jim Crow laws

No, the people who still supported the KKK and the ideology behind Jim Crow laws switched major parties, if they were associated with a major party, from the Democrats to the Republicans between the late mid-1960s and the mid-1990s, because of disaffection with the Democrats (initially particularly President Johnson) backing civil rights, but also because the Republicans started actively campaigning to their racist interests to leverage their disaffection with the Democrats.

In some cases, the people switching parties were literally the same people who had bolted temporarily from the Democratic Party in the 1940s over Truman's integration policies, but who had come back because they had no other major party to go to, and their own separate party had failed. (Strom Thurmond, the Dixiecrat Presidential candidate in 1948, is a notable, highly-visible example.)

And as this process continued it was self-reinforcing, because the more White supremacists left the Democratic Party for the Republicans, the stronger the Democratic support for the interests White supremacists opposed could be.

This theory is garbage because it totally forgets that REPUBLICANS passed the civil rights act and were still overwhelmingly less racist than their democratic counterparts. What you are saying is the equivalent of AOC voting for Trump because the party isnt radical enough. It’s a lie. Its always been a lie. Thats why democrat run cities since that day are some of the most destitute for black people. Democrats use them and its sickening. I’m a republican and I abhor any sort of racism. There are a lot more of me than you think and well find-out in November. One thing is for sure, Stop fighting hate with hate

The idea of "winning" a conversation is screwed up from the get-go.

Kennedy and Johnson were Democrats. The House and Senate were both Democratically controlled.

Saying that Republicans passed civil rights because there were 18 Southern Bloc Democrats who fought it in the Senate is just lying about the facts.

Based on the percentages it's blatantly obvious which party was more in favor of civil rights for minorities, Republicans. So why would the Racist democrats, the ones that voted no, want to join the party that was much more unanimous than the party in which they currently reside? What you are saying is like Nancy Pelosi becoming a republican because Trump became a democrat. It's absurd. You've been taught a lie. https://en.wikipedia.org/wiki/Civil_Rights_Act_of_1964

Okay... why did a Republican, nominee of the party "more in favor of civil rights for minorities," vote against the Civil Rights Act of 1964? And why did Nixon, a Republican, follow his lead in the following election, emphasizing law and order, an end to protests, and a war on drugs? Why did Strom Thurmond, a Democrat, join the Republican party?

You can't have it both ways!