my biggest criticism about the original Star Wars is that they called it a "Death Star". any evil imperialist organization worth its salt would hire a consulting firm to come up with something like "Liberation Sphere"
Evil authoritarian imperialist entities don't care what people think of them.
Wresting power is enough, and the threat of death has always been recognized as a highly persuasive and powerful motivator.
Particularly if you have a weapon that can vaporize planets.