Can we correct this bullshit right now?
The Empire was NOT racist. It was human-first, so species-ist would be a better world for it.
And this is a good thing. What fucking world would you want to live in, what GALAXY would you want to live in, where humans were treated as, at best, an upstart species, and at worst, a pest?
If we go off of purely Disney canon, then Palpatine saved the Senate, and indirectly, the galaxy, from a corrupt system, and the Jedi.
We all like to think the Jedi were good, but in reality, the Jedi were fucked up, and fucked up BAD. By Episode 3, they were about to commit an unlawful coup of the galactic-wide government because there was SUSPICION that Palatine may be a Sith. The Jedi became radical religious extremists who were threatening the stability of the galaxy in the middle of a civil war.
Palpatine not only saved the galaxy from these extremists, but he also united the galaxy by ending the worst war of the last 1000 years, and while yes, there were problems with some outer rim worlds, the reforms he made brought prosperity to the Core and Middle rims. The only reason the Outer Rim was so fucked was because even the Empire didn't have the reach to police the entire galaxy.
Finally, the Death Star, touted as the worst crime the Empire committed, was used as a purely retaliation weapon. What was the only planet hit? Alderaan. Not only was it a rebel world, but it was the SEAT of the rebellion's leaders. No shit something needed to be done.
The only other target? Yavin IV, the rebel's military base. Who the fuck would blame them for attacking a military base?
In short, Palpatine did nothing wrong. He was a human-centric leader who brought stability and prosperity to the galaxy in a time of turmoil, disproving the need of the Jedi order.