Perhaps, but I feel that a more entertaining debate is had when Godwin's law isn't involved.
Maybe so, but it has been stated numerous times that the Galactic Empire is similar in numerous ways to the Third Reich. I would compare the Sith Empire to Ancient Rome with some Communism attached.
Anyway. It's obvious that the Sith Empire is the bad guys. Anyone who doesn't think so needs to check their moral compass.
Because slavery is wrong. Genocide is wrong. Murder in general is wrong, but murder just because you feel like it is wrong. Need I go on. I've pretty much noted every evil deed the Empire has commited.