While the Galactic Empire has the appearance of xenophobia judging from its homogenious staff onboard Imperial Navy flagships and the Imperial military/political leadership, do you think the Rebel Alliance are also racist to a certain extent even if they have more non-humans serving in its ranks? While the EU has overplayed the Empire's evil up to cardboard panto villain proportions, I wouldn't be surprised if the Galactic Empire distributed anti-alien propaganda through schools and the mass media, while the Galactic Empire's military likely indocrinated into its young recruits a feeling of detached aloofness, especially towards non-humanoids. The Seperatist leadership being dominated by alien merchants and rulers wouldn't have helped either.
And for Imperial personnel defecting to the Rebel Alliance the negative feelings generated by omnipresent Imperial propaganda would've been hard to dispell and even for civilians recruits who were subjected to the "Us Vs. Them" sentiments generated by Imperial officials they used to pay their taxes to. And the Galactic Empire did not happen over night, since most of the Empire's components were already long in place for Emperor Palpatine to put together: the Old Republic was already human centric and its core leadership was dominated by humans, with the Core Worlds historically colonized by human civilizations. The Core Worlds' own armies, navies, and police forces that eventually formed the back bone of the Galactic Empire's behemoth military must've harboured anti-alien sentiments going back millennia, although more authoritarian individuals like Wilful Tarkin would've been thankfully constrained by the Old Republic's more fragmented, smaller, and regionalized military forces.
And on the subject of Tarkin, when he demolished Alderaan, that was when the Imperial citizens really started to turn against the Imperial leadership. The Empire had destroyed one of "its own" when it destroyed Alderaan, a Core World that founded the Old Republic, so was part of the old boy's club. Were there bigger outcries when the Wookies were carted off into slavery or when Outer Rim alien worlds were routinely turned to glass from towards the end of the Clone Wars onwards? Imagine BDZs being done out of grim necessity to flatten planetoids or space habitats that were turned into giant shipyards and battle droid factories, with few or no cities, but then it gradually morphed into punishing civilian populations of the alien variety.
And for Imperial personnel defecting to the Rebel Alliance the negative feelings generated by omnipresent Imperial propaganda would've been hard to dispell and even for civilians recruits who were subjected to the "Us Vs. Them" sentiments generated by Imperial officials they used to pay their taxes to. And the Galactic Empire did not happen over night, since most of the Empire's components were already long in place for Emperor Palpatine to put together: the Old Republic was already human centric and its core leadership was dominated by humans, with the Core Worlds historically colonized by human civilizations. The Core Worlds' own armies, navies, and police forces that eventually formed the back bone of the Galactic Empire's behemoth military must've harboured anti-alien sentiments going back millennia, although more authoritarian individuals like Wilful Tarkin would've been thankfully constrained by the Old Republic's more fragmented, smaller, and regionalized military forces.
And on the subject of Tarkin, when he demolished Alderaan, that was when the Imperial citizens really started to turn against the Imperial leadership. The Empire had destroyed one of "its own" when it destroyed Alderaan, a Core World that founded the Old Republic, so was part of the old boy's club. Were there bigger outcries when the Wookies were carted off into slavery or when Outer Rim alien worlds were routinely turned to glass from towards the end of the Clone Wars onwards? Imagine BDZs being done out of grim necessity to flatten planetoids or space habitats that were turned into giant shipyards and battle droid factories, with few or no cities, but then it gradually morphed into punishing civilian populations of the alien variety.