The parties did switch sides, funnily enough. With your logic, you're trying to state that all the current KKK members, Proud Boys, nei-nazis, and facsists aren't voting Red lol
Like, you DO realize that a shitton of decent Republicans LEFT the Right and became Democrats when Reagan was in office, right?
That Lincoln was a Republican, but still had the temperment and policies of a modern day Dem, riiight? I think the issue is less that the Left doesn't know how history works, and more you don't know how reality works lol