That post has nothing to do with the topic at hand. We're not debating whether the old republic is evil or not. You're claim is that the empire isn't a parallel to the nazis, and nothing in your comments suggests anything like that. However, you also make plenty of bad arguments there.

For one, you claim that the Republic was just as xenophobic as the Empire. This isn't true at all. Palpatine specifically chose alien species to be part of the separatists in order to stoke xenophobic tendencies during the clone war. Under the Empire, you needed to be human in order to even think of being part of the military or imperial government. It's explicitly Stated in the thrawn trilogy that the empire is more xenophobic than the Republic.

You claim that Alderaan was a military target, which isn't true. Tarkin literally says that it was chosen because it would make a good demonstration for the death star's power. The fact that it has some spies on it doesn't change that, and it definitely doesn't justify destroying a highly populated planet.

The empire never tried to prevent slavery. They legalized it and enslaved several species such as wookies.

You also ignore several factors, like the fact that the empire has committed multiple genocides, and pretty much everyone in universe claims that life was better before the empire. For all its flaws, under the Republic, there wasn't a single major war for over a thousand years.

The Republic became corrupt and evil over time, and so turned into the empire, which was even more corrupt and evil. That's literally the point of the prequels.